Legendary creatures don't untap during their controllers' untap steps.
When Arena of the Ancients enters the battlefield, tap all legendary creatures.
{G}{W}
Aura Mutation
Instant
Destroy target enchantment. Create X 1/1 green Saproling creature tokens, where X is that enchantment's mana value.
--
Blighted Woodland
Land
{T}: Add {C}.
{3}{G}, {T}, Sacrifice Blighted Woodland: Search your library for up to two basic land cards, put them onto the battlefield tapped, then shuffle.
--
Bojuka Bog
Land
Bojuka Bog enters the battlefield tapped.
When Bojuka Bog enters the battlefield, exile target player's graveyard.
{T}: Add {B}.
--
Caldera Lake
Land
Caldera Lake enters the battlefield tapped.
{T}: Add {C}.
{T}: Add {U} or {R}. Caldera Lake deals 1 damage to you.
{2}{W}{U}
Cloud Cover
Enchantment
Whenever another permanent you control becomes the target of a spell or ability an opponent controls, you may return that permanent to its owner's hand.
--
Coastal Tower
Land
Coastal Tower enters the battlefield tapped.
{T}: Add {W} or {U}.
{U}{B}{R}
Crosis's Charm
Instant
Choose one --
• Return target permanent to its owner's hand.
• Destroy target nonblack creature. It can't be regenerated.
• Destroy target artifact.
{2}{R}{G}
Decimate
Sorcery
Destroy target artifact, target creature, target enchantment, and target land. (You can't cast this spell unless you have legal choices for all its targets.)
{U}{B}
Diabolic Vision
Sorcery
Look at the top five cards of your library. Put one of them into your hand and the rest on top of your library in any order.
{3}
Drake-Skull Cameo
Artifact
{T}: Add {U} or {B}.
{1}{B}{G}
Ebony Treefolk
Creature - Treefolk
{B}{G}: Ebony Treefolk gets +1/+1 until end of turn.
3 /
3
{U}{B}{R}
Elemental Augury
Enchantment
{3}: Look at the top three cards of target player's library, then put them back in any order.
--
Elfhame Palace
Land
Elfhame Palace enters the battlefield tapped.
{T}: Add {G} or {W}.
{2}
Fellwar Stone
Artifact
{T}: Add one mana of any color that a land an opponent controls could produce.
{1}{R}{G}
Fires of Yavimaya
Enchantment
Creatures you control have haste.
Sacrifice Fires of Yavimaya: Target creature gets +2/+2 until end of turn.
{2}{U}{B}
Flooded Woodlands
Enchantment
Green creatures can't attack unless their controller sacrifices a land for each green creature they control that's attacking. (This cost is paid as attackers are declared.)
--
Forest
Basic Land - Forest
({T}: Add {G}.)
--
Forest
Basic Land - Forest
({T}: Add {G}.)
--
Forest
Basic Land - Forest
({T}: Add {G}.)
--
Forest
Basic Land - Forest
({T}: Add {G}.)
--
Forest
Basic Land - Forest
({T}: Add {G}.)
{3}{R}{G}
Frenzied Tilling
Sorcery
Destroy target land. Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle.
{G}{U}
Gaea's Skyfolk
Creature - Elf Merfolk
Flying
2 /
2
{W}{U}
Galina's Knight
Creature - Merfolk Knight
Protection from red
2 /
2
{W}{U}{B}{R}{G}
Garth One-Eye
Legendary Creature - Human Wizard
{T}: Choose a card name that hasn't been chosen from among Disenchant, Braingeyser, Terror, Shivan Dragon, Regrowth, and Black Lotus. Create a copy of the card with the chosen name. You may cast the copy. (You still pay its costs.)
5 /
5
{G}{W}
Gerrard's Command
Instant
Untap target creature. It gets +3/+3 until end of turn.
{R}{G}
Goblin Anarchomancer
Creature - Goblin Shaman
Each spell you cast that's red or green costs {1} less to cast.
2 /
2
--
Grand Coliseum
Land
Grand Coliseum enters the battlefield tapped.
{T}: Add {C}.
{T}: Add one mana of any color. Grand Coliseum deals 1 damage to you.
{G}{U}{R}
Guided Passage
Sorcery
Reveal the cards in your library. An opponent chooses from among them a creature card, a land card, and a noncreature, nonland card. You put the chosen cards into your hand. Then shuffle.
{1}{W}{U}
Guiding Spirit
Creature - Angel Spirit
Flying
{T}: If the top card of target player's graveyard is a creature card, put that card on top of that player's library.
1 /
2
{2}{G}{W}
Horned Cheetah
Creature - Cat
Whenever Horned Cheetah deals damage, you gain that much life.
2 /
2
{R}{G}
Horned Kavu
Creature - Kavu
When Horned Kavu enters the battlefield, return a red or green creature you control to its owner's hand.
3 /
4
{R}{G}
Hull Breach
Sorcery
Choose one --
• Destroy target artifact.
• Destroy target enchantment.
• Destroy target artifact and target enchantment.
{3}{G}{W}
Hymn of Rebirth
Sorcery
Put target creature card from a graveyard onto the battlefield under your control.
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
{1}{B}{R}
Keldon Twilight
Enchantment
At the beginning of each player's end step, if no creatures attacked this turn, that player sacrifices a creature they controlled since the beginning of the turn.
{3}{G}{W}
Kjeldoran Frostbeast
Creature - Elemental Beast
At end of combat, destroy all creatures blocking or blocked by Kjeldoran Frostbeast.
2 /
4
--
Krosan Verge
Land
Krosan Verge enters the battlefield tapped.
{T}: Add {C}.
{2}, {T}, Sacrifice Krosan Verge: Search your library for a Forest card and a Plains card, put them onto the battlefield tapped, then shuffle.
{1}{B}{R}
Lava Zombie
Creature - Zombie
When Lava Zombie enters the battlefield, return a black or red creature you control to its owner's hand.
{2}: Lava Zombie gets +1/+0 until end of turn.
4 /
3
{B}{G}
Llanowar Dead
Creature - Zombie Elf
{T}: Add {B}.
2 /
2
{3}{G}{W}
Mirari's Wake
Enchantment
Creatures you control get +1/+1.
Whenever you tap a land for mana, add one mana of any type that land produced.
{1}{B}{R}{G}
Misfortune
Sorcery
An opponent chooses one --
• You put a +1/+1 counter on each creature you control and gain 4 life.
• You put a -1/-1 counter on each creature that player controls and Misfortune deals 4 damage to that player.
{2}{R}{G}
Monsoon
Enchantment
At the beginning of each player's end step, tap all untapped Islands that player controls and Monsoon deals X damage to the player, where X is the number of Islands tapped this way.
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
{1}{U}{B}
Mundungu
Creature - Human Wizard
{T}: Counter target spell unless its controller pays {1} and 1 life.
1 /
1
{2}{G}{W}
Mystic Enforcer
Creature - Human Nomad Mystic
Protection from black
Threshold -- As long as seven or more cards are in your graveyard, Mystic Enforcer gets +3/+3 and has flying.
3 /
3
{1}{G}{U}{U}
Mystic Snake
Creature - Snake
Flash
When Mystic Snake enters the battlefield, counter target spell.
2 /
2
{3}{W}{U}
Ordered Migration
Sorcery
Domain -- Create a 1/1 blue Bird creature token with flying for each basic land type among lands you control.
{1}{R}{G}
Overabundance
Enchantment
Whenever a player taps a land for mana, that player adds one mana of any type that land produced, and Overabundance deals 1 damage to the player.
{2}{B}{R}
Phyrexian Purge
Sorcery
This spell costs 3 life more to cast for each target.
Destroy any number of target creatures.
{U}{B}{R}
Phyrexian Tyranny
Enchantment
Whenever a player draws a card, that player loses 2 life unless they pay {2}.
--
Pine Barrens
Land
Pine Barrens enters the battlefield tapped.
{T}: Add {C}.
{T}: Add {B} or {G}. Pine Barrens deals 1 damage to you.
--
Plains
Basic Land - Plains
({T}: Add {W}.)
--
Plains
Basic Land - Plains
({T}: Add {W}.)
--
Plains
Basic Land - Plains
({T}: Add {W}.)
--
Plains
Basic Land - Plains
({T}: Add {W}.)
{2}{R}{W}
Powerstone Minefield
Enchantment
Whenever a creature attacks or blocks, Powerstone Minefield deals 2 damage to it.
{R}{G}{W}
Radiant Kavu
Creature - Kavu
{R}{G}{W}: Prevent all combat damage blue creatures and black creatures would deal this turn.
3 /
3
{1}{R}{G}
Raging Kavu
Creature - Kavu
Flash
Haste
3 /
1
{B}{R}
Rakdos Charm
Instant
Choose one --
• Exile target player's graveyard.
• Destroy target artifact.
• Each creature deals 1 damage to its controller.
{U}{R}
Razorfin Hunter
Creature - Merfolk Goblin
{T}: Razorfin Hunter deals 1 damage to any target.
1 /
1
{1}{W}{U}
Reparations
Enchantment
Whenever an opponent casts a spell that targets you or a creature you control, you may draw a card.
--
Riftstone Portal
Land
{T}: Add {C}.
As long as Riftstone Portal is in your graveyard, lands you control have "{T}: Add {G} or {W}."
{1}{W}{B}
Righteous War
Enchantment
White creatures you control have protection from black.
Black creatures you control have protection from white.
{1}{W}{U}
Riptide Crab
Creature - Crab
Vigilance
When Riptide Crab dies, draw a card.
1 /
3
--
Salt Flats
Land
Salt Flats enters the battlefield tapped.
{T}: Add {C}.
{T}: Add {W} or {B}. Salt Flats deals 1 damage to you.
--
Salt Marsh
Land
Salt Marsh enters the battlefield tapped.
{T}: Add {U} or {B}.
--
Scabland
Land
Scabland enters the battlefield tapped.
{T}: Add {C}.
{T}: Add {R} or {W}. Scabland deals 1 damage to you.
{1}{G}{U}
Shardless Agent
Artifact Creature - Human Rogue
Cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom of your library in a random order.)
2 /
2
--
Shivan Oasis
Land
Shivan Oasis enters the battlefield tapped.
{T}: Add {R} or {G}.
{1}{W}{U}
Silver Drake
Creature - Drake
Flying
When Silver Drake enters the battlefield, return a white or blue creature you control to its owner's hand.
3 /
3
{1}{W}{U}
Sky Spirit
Creature - Spirit
Flying, first strike
2 /
2
--
Skyshroud Forest
Land
Skyshroud Forest enters the battlefield tapped.
{T}: Add {C}.
{T}: Add {G} or {U}. Skyshroud Forest deals 1 damage to you.
{R}{W}
Squee's Embrace
Enchantment - Aura
Enchant creature
Enchanted creature gets +2/+2.
When enchanted creature dies, return that card to its owner's hand.
{1}{U}{U}{R}
Suffocating Blast
Instant
Counter target spell and Suffocating Blast deals 3 damage to target creature.
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
{2}
Talisman of Curiosity
Artifact
{T}: Add {C}.
{T}: Add {G} or {U}. Talisman of Curiosity deals 1 damage to you.
{2}
Talisman of Resilience
Artifact
{T}: Add {C}.
{T}: Add {B} or {G}. Talisman of Resilience deals 1 damage to you.
{1}{W}{U}
Tempest Drake
Creature - Drake
Flying, vigilance
2 /
2
{1}{G}{U}
Temporal Spring
Sorcery
Put target permanent on top of its owner's library.
{2}{B}{R}
Terminal Agony
Sorcery
Destroy target creature.
Madness {B}{R} (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)
{B}{R}
Terminate
Instant
Destroy target creature. It can't be regenerated.
{R}{G}
Territorial Kavu
Creature - Kavu
Domain -- Territorial Kavu's power and toughness are each equal to the number of basic land types among lands you control.
Whenever Territorial Kavu attacks, choose one --
• Discard a card. If you do, draw a card.
• Exile up to one target card from a graveyard.
* /
*
{3}
Tigereye Cameo
Artifact
{T}: Add {G} or {W}.
{G}{W}{U}
Treva's Charm
Instant
Choose one --
• Destroy target enchantment.
• Exile target attacking creature.
• Draw a card, then discard a card.
{3}
Troll-Horn Cameo
Artifact
{T}: Add {R} or {G}.
{U}{U}{B}
Undermine
Instant
Counter target spell. Its controller loses 3 life.
{1}{U}{B}
Urborg Drake
Creature - Drake
Flying
Urborg Drake attacks each combat if able.
2 /
3
--
Urborg Volcano
Land
Urborg Volcano enters the battlefield tapped.
{T}: Add {B} or {R}.
{1}{B}{R}
Vicious Kavu
Creature - Kavu
Whenever Vicious Kavu attacks, it gets +2/+0 until end of turn.
2 /
2
{1}{U}{B}
Vile Consumption
Enchantment
All creatures have "At the beginning of your upkeep, sacrifice this creature unless you pay 1 life."
{U}{B}
Vodalian Zombie
Creature - Merfolk Zombie
Protection from green
2 /
2
{2}{R}{G}
Yavimaya Kavu
Creature - Kavu
Yavimaya Kavu's power is equal to the number of red creatures on the battlefield.
Yavimaya Kavu's toughness is equal to the number of green creatures on the battlefield.