Put a flood counter on target land. That land is an Island in addition to its other types for as long as it has a flood counter on it. If you control a Merfolk, draw a card.

{T}: Add one mana of any color in your commander's color identity.

Whenever Arcbound Slith deals combat damage to a player, put a +1/+1 counter on it.

Modular 1 (This creature enters the battlefield with a +1/+1 counter on it. When it dies, you may put its +1/+1 counters on target artifact creature.)

{S}{S}: Ascendant Spirit becomes a Spirit Warrior with base power and toughness 2/3.

{S}{S}{S}: If Ascendant Spirit is a Warrior, put a flying counter on it and it becomes a Spirit Warrior Angel with base power and toughness 4/4.

{S}{S}{S}{S}: If Ascendant Spirit is an Angel, put two +1/+1 counters on it and it gains "Whenever this creature deals combat damage to a player, draw a card."

Whenever Avenging Druid deals damage to an opponent, you may reveal cards from the top of your library until you reveal a land card. If you do, put that card onto the battlefield and put all other cards revealed this way into your graveyard.

Return target card from your graveyard to your hand.

Bala Ged Sanctuary enters the battlefield tapped.

{T}: Add {G}.

Equipped creature gets +1/+1 for each charge counter on Banshee's Blade.

Whenever equipped creature deals combat damage, put a charge counter on Banshee's Blade.

Equip {2} ({2}: Attach to target creature you control. Equip only as a sorcery. This card enters the battlefield unattached and stays on the battlefield if the creature leaves.)

Flying; swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)

Destroy target permanent. Its controller creates a 3/3 green Beast creature token.

Whenever a creature you control attacks, you may put a quest counter on Beastmaster Ascension.

As long as Beastmaster Ascension has seven or more quest counters on it, creatures you control get +5/+5.

Whenever a creature you control deals combat damage to a player, you may draw a card.

{1}{U}, {T}: Creatures your opponents control attack this turn if able.

Flying

{T}: Add one mana of any color.

Equipped creature has myriad. (Whenever it attacks, for each opponent other than defending player, you may create a token that's a copy of that creature that's tapped and attacking that player or a planeswalker they control. Exile the tokens at end of combat.)

Equip {4}

{2}, {T}: Add {B} for each Swamp you control.

Whenever you draw a card, put a +1/+1 counter on Chasm Skulker.

When Chasm Skulker dies, create X 1/1 blue Squid creature tokens with islandwalk, where X is the number of +1/+1 counters on Chasm Skulker. (They can't be blocked as long as defending player controls an Island.)

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)

Whenever Cold-Eyed Selkie deals combat damage to a player, you may draw that many cards.

{T}: Add one mana of any color in your commander's color identity.

Sacrifice Commander's Sphere: Draw a card.

As an additional cost to cast this spell, sacrifice a land.

Search your library for a land card, put that card onto the battlefield, then shuffle.

Search your library for up to two basic land cards, reveal those cards, put one onto the battlefield tapped and the other into your hand, then shuffle.

Enchant creature

Whenever enchanted creature deals damage to an opponent, you may draw a card.

Enchant creature

Enchanted creature gets +1/+1 and has "Whenever this creature deals combat damage to a player, you may draw a card."

At the beginning of your end step, if you didn't attack with a creature this turn, sacrifice Curious Obsession.

Destroy target creature. Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.

When Dowsing Dagger enters the battlefield, target opponent creates two 0/2 green Plant creature tokens with defender.

Equipped creature gets +2/+1.

Whenever equipped creature deals combat damage to a player, you may transform Dowsing Dagger.

Equip {2}

(Transforms from Dowsing Dagger.)

{T}: Add three mana of any one color.

Nonbasic landwalk (This creature can't be blocked as long as defending player controls a nonbasic land.)

Elvish Reclaimer gets +2/+2 as long as there are three or more land cards in your graveyard.

{2}, {T}, Sacrifice a land: Search your library for a land card, put it onto the battlefield tapped, then shuffle.

Multikicker {1}{U} (You may pay an additional {1}{U} any number of times as you cast this spell.)

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)

Enclave Elite enters the battlefield with a +1/+1 counter on it for each time it was kicked.

Search your library for a card, put that card into your graveyard, then shuffle.

Return all creatures to their owners' hands.

{2}, {T}, Sacrifice Expedition Map: Search your library for a land card, reveal it, put it into your hand, then shuffle.

Search your library for a Plains, Island, Swamp, or Mountain card, put it onto the battlefield tapped, then shuffle.

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)

As long as Filth is in your graveyard and you control a Swamp, creatures you control have swampwalk.

({T}: Add {G}.)

({T}: Add {G}.)

({T}: Add {G}.)

({T}: Add {G}.)

({T}: Add {G}.)

({T}: Add {G}.)

({T}: Add {G}.)

({T}: Add {G}.)

({T}: Add {G}.)

({T}: Add {G}.)

Whenever a creature you control becomes blocked, you may return it to its owner's hand.

Whenever one or more creatures you control deal combat damage to a player, draw a card.

Permanents you control gain hexproof and indestructible until end of turn.

{T}: Add {C}.

{T}: Each player gains control of all creatures they own.

Counter target spell that targets a creature.

({T}: Add {U}.)

({T}: Add {U}.)

({T}: Add {U}.)

({T}: Add {U}.)

({T}: Add {U}.)

({T}: Add {U}.)

({T}: Add {U}.)

({T}: Add {U}.)

({T}: Add {U}.)

({T}: Add {U}.)

{T}: Target creature gains forestwalk until end of turn. (It can't be blocked as long as defending player controls a Forest.)

Enchant creature

Whenever enchanted creature deals damage to an opponent, you may draw a card.

Counter target spell that targets a permanent you control.

Draw a card.

Search your library for up to two basic land cards, reveal those cards, put one onto the battlefield tapped and the other into your hand, then shuffle.

Whenever a Forest an opponent controls becomes tapped, you gain 1 life.

Equipped creature has haste and shroud. (It can't be the target of spells or abilities.)

Equip {0}

Whenever equipped creature deals combat damage to a player, you may draw two cards. If you do, discard a card.

Equip {1} ({1}: Attach to target creature you control. Equip only as a sorcery.)

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)

Whenever Merfolk Spy deals combat damage to a player, that player reveals a card at random from their hand.

First strike, forestwalk, vigilance (This creature deals combat damage before creatures without first strike, it can't be blocked as long as defending player controls a Forest, and attacking doesn't cause this creature to tap.)

Whenever Mischievous Catgeist deals combat damage to a player, draw a card.

Disturb {2}{U} (You may cast this card from your graveyard transformed for its disturb cost.)

Enchant creature

Enchanted creature has "Whenever this creature deals combat damage to a player, draw a card."

If Catlike Curiosity would be put into a graveyard from anywhere, exile it instead.

All creatures get -1/-1 until end of turn for each Swamp you control.

Choose one --

• Search your library for up to X land cards, reveal them, put them into your hand, then shuffle.

• Nylea's Intervention deals twice X damage to each creature with flying.

Enchant creature

Whenever enchanted creature deals combat damage to a player, you may search your library for a basic land card, put that card onto the battlefield tapped, then shuffle.

When Phage the Untouchable enters the battlefield, if you didn't cast it from your hand, you lose the game.

Whenever Phage deals combat damage to a creature, destroy that creature. It can't be regenerated.

Whenever Phage deals combat damage to a player, that player loses the game.

Destroy target creature. It can't be regenerated. Its controller creates a 3/3 green Ape creature token.

Whenever a creature you control becomes tapped, you may put a quest counter on Quest for Renewal.

As long as there are four or more quest counters on Quest for Renewal, untap all creatures you control during each other player's untap step.

At the beginning of each player's upkeep, that player puts a flood counter on target non-Island land they control of their choice. That land is an Island for as long as it has a flood counter on it.

At the beginning of each end step, if all lands on the battlefield are Islands, remove all flood counters from them.

Equipped creature has deathtouch.

Whenever equipped creature deals combat damage to a player, that player loses half their life, rounded up.

Equip {3}

Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle.

You may play lands from your graveyard.

Destroy target creature. It can't be regenerated. That creature's controller creates a 3/3 green Frog Lizard creature token.

Exile target artifact or creature. Its controller creates a 4/4 blue and red Elemental creature token.

Choose one --

• Destroy target artifact.

• Destroy target enchantment.

• Exile target card from a graveyard.

Whenever equipped creature deals combat damage to a player, you may draw a card.

Equip {2} ({2}: Attach to target creature you control. Equip only as a sorcery.)

Sacrifice any number of lands. Search your library for up to that many land cards, put them onto the battlefield tapped, then shuffle.

Living weapon (When this Equipment enters the battlefield, create a 0/0 black Phyrexian Germ creature token, then attach this to it.)

Equipped creature gets +1/+1.

Whenever equipped creature deals combat damage to a player, that player loses half their life, rounded up.

Equip {3}

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)

At the beginning of your upkeep, return target creature card from your graveyard to the battlefield.

At the beginning of each opponent's upkeep, that player sacrifices a creature.

Enchant creature

Enchanted creature has "Whenever this creature deals combat damage to a player, you may draw a card."

Haste

Whenever Skullbriar, the Walking Grave deals combat damage to a player, put a +1/+1 counter on it.

Counters remain on Skullbriar as it moves to any zone other than a player's hand or library.

Enchant creature

Enchanted creature has fear. (It can't be blocked except by artifact creatures and/or black creatures.)

Whenever enchanted creature deals combat damage to an opponent, you may draw a card.

Whenever Slith Bloodletter deals combat damage to a player, put a +1/+1 counter on it.

{1}{B}: Regenerate Slith Bloodletter.

Trample

Whenever Slith Predator deals combat damage to a player, put a +1/+1 counter on it.

{T}: Add {C}{C}.

Enchant land

When Spreading Seas enters the battlefield, draw a card.

Enchanted land is an Island.

Swampwalk, forestwalk (This creature can't be blocked as long as defending player controls a Swamp or a Forest.)

{T}: Target Merfolk creature gets +1/+1 and gains islandwalk until end of turn. (It can't be blocked as long as defending player controls an Island.)

{T}: Target land becomes an Island until end of turn.

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

({T}: Add {B}.)

Equipped creature has hexproof and haste. (It can't be the target of spells or abilities your opponents control.)

Equip {1}

Search your library for a land card, reveal it, put it into your hand, then shuffle.

Tempting offer -- Search your library for a land card and put it onto the battlefield. Each opponent may search their library for a land card and put it onto the battlefield. For each opponent who searches a library this way, search your library for a land card and put it onto the battlefield. Then each player who searched a library this way shuffles.

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)

Whenever Thada Adel, Acquisitor deals combat damage to a player, search that player's library for an artifact card and exile it. Then that player shuffles. Until end of turn, you may play that card.

You may look at the top card of your library any time.

As long as The Reality Chip is attached to a creature, you may play lands and cast spells from the top of your library.

Reconfigure {2}{U} ({2}{U}: Attach to target creature you control; or unattach from a creature. Reconfigure only as a sorcery. While attached, this isn't a creature.)

Tolaria West enters the battlefield tapped.

{T}: Add {U}.

Transmute {1}{U}{U} ({1}{U}{U}, Discard this card: Search your library for a card with mana value 0, reveal it, put it into your hand, then shuffle. Transmute only as a sorcery.)

As an additional cost to cast this spell, pay X life.

All creatures get -X/-X until end of turn.

Counter target spell that targets a permanent you control.

Search your library for a nonlegendary card, put that card into your graveyard, then shuffle.

Each land is a Swamp in addition to its other land types.

Whenever Vedalken Heretic deals damage to an opponent, you may draw a card.

You may exile a green card from your hand rather than pay this spell's mana cost.

Flash

Forestwalk (This creature can't be blocked as long as defending player controls a Forest.)

Partner with Gorm the Great (When this creature enters the battlefield, target player may put Gorm into their hand from their library, then shuffle.)

Deathtouch

Whenever Virtus the Veiled deals combat damage to a player, that player loses half their life, rounded up.

Equipped creature gets +2/+0 and has deathtouch.

{5}{B}{B}{B}: Until end of turn, Vorpal Sword gains "Whenever equipped creature deals combat damage to a player, that player loses the game."

Equip {B}{B}

{T}: Target creature gains forestwalk until end of turn. (It can't be blocked as long as defending player controls a Forest.)

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)

{B}: Whispering Shade gets +1/+1 until end of turn.

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)

{T}: Add {B}{B}{B}{B}. Target opponent gains control of Witch Engine. (Activate only as an instant.)

{T}: Add {C}.

{2}, {T}: Target commander gains lifelink until end of turn.

Islandwalk, swampwalk (This creature can't be blocked as long as defending player controls an Island or a Swamp.)

Whenever Wrexial, the Risen Deep deals combat damage to a player, you may cast target instant or sorcery card from that player's graveyard without paying its mana cost. If that spell would be put into a graveyard, exile it instead.

Forestwalk (This creature can't be blocked as long as defending player controls a Forest.)

When Yavimaya Dryad enters the battlefield, you may search your library for a Forest card, put it onto the battlefield tapped under target player's control, then shuffle.

Each land is a Forest in addition to its other land types.