When Ainok Guide enters the battlefield, choose one --

• Put a +1/+1 counter on Ainok Guide.

• Search your library for a basic land card, reveal it, then shuffle and put that card on top.

+1: Distribute three +1/+1 counters among one, two, or three target creatures you control.

+1: Look at the top four cards of your library. You may reveal an Aura, creature, or planeswalker card from among them and put it into your hand. Put the rest on the bottom of your library in any order.

-8: You gain 100 life.

Whenever you're dealt damage, you may put that many charge counters on Angelheart Vial.

{2}, {T}, Remove four charge counters from Angelheart Vial: You gain 2 life and draw a card.

Flying

When Angelic Quartermaster enters the battlefield, put a +1/+1 counter on each of up to two other target creatures.

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.

Flying

Inspired -- Whenever Arbiter of the Ideal becomes untapped, reveal the top card of your library. If it's an artifact, creature, or land card, you may put it onto the battlefield with a manifestation counter on it. That permanent is an enchantment in addition to its other types.

{T}: Draw a card, then discard a card. Put a quest counter on Arcade Gannon.

For Auld Lang Syne -- Once during each of your turns, you may cast an artifact or Human spell from your graveyard with mana value less than or equal to the number of quest counters on Arcade Gannon.

Enchant creature

At the beginning of your upkeep, you may put an arrow counter on Archery Training.

Enchanted creature has "{T}: This creature deals X damage to target attacking or blocking creature, where X is the number of arrow counters on Archery Training."

At the beginning of each end step, if you drew two or more cards this turn, you may put a quest counter on Archmage Ascension.

As long as Archmage Ascension has six or more quest counters on it, if you would draw a card, you may instead search your library for a card, put that card into your hand, then shuffle.

At the beginning of your upkeep, put a doom counter on Armageddon Clock.

At the beginning of your draw step, Armageddon Clock deals damage equal to the number of doom counters on it to each player.

{4}: Remove a doom counter from Armageddon Clock. Any player may activate this ability but only during any upkeep step.

Armored Scrapgorger gets +3/+0 as long as it has three or more oil counters on it.

{T}: Add one mana of any color.

Whenever Armored Scrapgorger becomes tapped, exile target card from a graveyard and put an oil counter on Armored Scrapgorger.

Arwen, Mortal Queen enters the battlefield with an indestructible counter on it.

{1}, Remove an indestructible counter from Arwen: Another target creature gains indestructible until end of turn. Put a +1/+1 counter and a lifelink counter on that creature and a +1/+1 counter and a lifelink counter on Arwen.

At the beginning of your upkeep, put a time counter on As Foretold.

Once each turn, you may pay {0} rather than pay the mana cost for a spell you cast with mana value X or less, where X is the number of time counters on As Foretold.

Creatures you control have reach.

Sacrifice Assemble the Entmoot: Create three tapped X/X green Treefolk creature tokens, where X is the amount of life you gained this turn. Put a reach counter on each of them.

Whenever you cast a noncreature spell, put an oil counter on Atmosphere Surgeon.

Remove an oil counter from Atmosphere Surgeon: Target creature gains flying until end of turn. Activate only as a sorcery.

Hexproof

At the beginning of combat on your turn, put two +1/+1 counters on another target creature you control.

Daybound (If a player casts no spells during their own turn, it becomes night next turn.)

Hexproof

Other permanents you control have hexproof.

At the beginning of combat on your turn, put two +1/+1 counters on each creature you control.

Nightbound (If a player casts at least two spells during their own turn, it becomes day next turn.)

Flying

Whenever Aven Courier attacks, choose a counter on a permanent you control. Put a counter of that kind on target permanent you control if it doesn't have a counter of that kind on it.

Flying

At the beginning of your upkeep, you may put a feather counter on target creature. If you do, that creature has base power and toughness 3/1 and has flying for as long as it has a feather counter on it.

Double strike

Whenever Avenging Huntbonder attacks, put a double strike counter on another target attacking creature.

Flying

Cycling {2}{U} ({2}{U}, Discard this card: Draw a card.)

When you cycle Avian Oddity, put a flying counter on target creature you control.

At the beginning of your upkeep, put a filibuster counter on Azor's Elocutors. Then if Azor's Elocutors has five or more filibuster counters on it, you win the game.

Whenever a source deals damage to you, remove a filibuster counter from Azor's Elocutors.

When Backup Agent enters the battlefield, put a +1/+1 counter on target creature.

Whenever you cast a Spirit or Arcane spell, you may put a ki counter on Baku Altar.

{2}, {T}, Remove a ki counter from Baku Altar: Create a 1/1 colorless Spirit creature token.

When Bane of Progress enters the battlefield, destroy all artifacts and enchantments. Put a +1/+1 counter on Bane of Progress for each permanent destroyed this way.

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.)

{T}: Prevent the next 1 damage that would be dealt to any target this turn.

Put a -1/-1 counter on Barrenton Medic: Untap Barrenton Medic.

At the beginning of your upkeep, you may put a page counter on Barrin's Codex.

{4}, {T}, Sacrifice Barrin's Codex: Draw X cards, where X is the number of page counters on Barrin's Codex.

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.

Benevolent Hydra enters the battlefield with X +1/+1 counters on it.

If one or more +1/+1 counters would be put on another creature you control, that many plus one +1/+1 counters are put on it instead.

{T}, Remove a +1/+1 counter from Benevolent Hydra: Put a +1/+1 counter on another target creature you control.

Put a shield counter on target creature. (If it would be dealt damage or destroyed, remove a shield counter from it instead.)

Scry 1.

Constellation -- Whenever Boon of the Spirit Realm or another enchantment enters the battlefield under your control, put a blessing counter on Boon of the Spirit Realm.

Creatures you control get +1/+1 for each blessing counter on Boon of the Spirit Realm.

At the beginning of your precombat main phase, remove all flood counters from Bounty of the Luxa. If no counters were removed this way, put a flood counter on Bounty of the Luxa and draw a card. Otherwise, add {C}{G}{U}.

Braided Net enters the battlefield with three net counters on it.

{T}, Remove a net counter from Braided Net: Tap another target nonland permanent. Its activated abilities can't be activated for as long as it remains tapped.

Craft with artifact {1}{U}

{3}{U}, {T}: Draw a card for each artifact you control, then put Braided Quipu into its owner's library third from the top.

First strike

Sacrifice Brass-Talon Chimera: Put a +2/+2 counter on target Chimera creature. It gains first strike. (This effect lasts indefinitely.)

Trample

When Bribe Taker enters the battlefield, for each kind of counter on permanents you control, you may put your choice of a +1/+1 counter or a counter of that kind on Bribe Taker.

{T}: Add {C}.

{1}, {T}: Put a storage counter on Calciform Pools.

{1}, Remove X storage counters from Calciform Pools: Add X mana in any combination of {W} and/or {U}.

Return target creature card with mana value 3 or less from your graveyard to the battlefield. Put a flying counter on it. It's a Spirit in addition to its other types.

Revolt -- At the beginning of your end step, if a permanent you controlled left the battlefield this turn, put a unity counter on Call for Unity.

Creatures you control get +1/+1 for each unity counter on Call for Unity.

Each creature you control with a counter on it has ward {1}. (Whenever it becomes the target of a spell or ability an opponent controls, counter it unless that player pays {1}.)

{T}: Put a +1/+1 counter on target creature that entered the battlefield this turn.

When Channeler Initiate enters the battlefield, put three -1/-1 counters on target creature you control.

{T}, Remove a -1/-1 counter from Channeler Initiate: Add one mana of any color.

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.)

Enchant creature

As Chromatic Armor enters the battlefield, choose a color.

Chromatic Armor enters the battlefield with a sleight counter on it.

Prevent all damage that would be dealt to enchanted creature by sources of the last chosen color.

{X}: Put a sleight counter on Chromatic Armor and choose a color. X is the number of sleight counters on Chromatic Armor.

Buyback {3} (You may pay an additional {3} as you cast this spell. If you do, put this card into your hand as it resolves.)

Choose a counter on target permanent or suspended card. Remove that counter from that permanent or card or put another of those counters on it.

Clockwork Steed enters the battlefield with four +1/+0 counters on it.

Clockwork Steed can't be blocked by artifact creatures.

At end of combat, if Clockwork Steed attacked or blocked this combat, remove a +1/+0 counter from it.

{X}, {T}: Put up to X +1/+0 counters on Clockwork Steed. This ability can't cause the total number of +1/+0 counters on Clockwork Steed to be greater than four. Activate only during your upkeep.

Clockwork Swarm enters the battlefield with four +1/+0 counters on it.

Clockwork Swarm can't be blocked by Walls.

At end of combat, if Clockwork Swarm attacked or blocked this combat, remove a +1/+0 counter from it.

{X}, {T}: Put up to X +1/+0 counters on Clockwork Swarm. This ability can't cause the total number of +1/+0 counters on Clockwork Swarm to be greater than four. Activate only during your upkeep.

{T}: Add one mana of any color.

{T}: Put a charge counter on Coalition Relic.

At the beginning of your first main phase, remove all charge counters from Coalition Relic. Add one mana of any color for each charge counter removed this way.

{T}, Remove a component counter from Component Pouch: Add two mana of different colors.

{T}: Roll a d20.

1--9 | Put a component counter on Component Pouch.

10--20 | Put two component counters on Component Pouch.

When Contagion Clasp enters the battlefield, put a -1/-1 counter on target creature.

{4}, {T}: Proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

Whenever you're dealt combat damage, the attacking player gains control of Contested Game Ball and untaps it.

{2}, {T}: Draw a card and put a point counter on Contested Game Ball. Then if it has five or more point counters on it, sacrifice it and create a Treasure token.

Addendum -- If you cast this spell during your main phase, put a shield counter on a creature you control. (If it would be dealt damage or destroyed, remove a shield counter from it instead.)

Choose a kind of counter on a creature you control. Put a counter of that kind on each other creature you control.

Coral Reef enters the battlefield with four polyp counters on it.

Sacrifice an Island: Put two polyp counters on Coral Reef.

{U}, Tap an untapped blue creature you control, Remove a polyp counter from Coral Reef: Put a +0/+1 counter on target creature.

At the beginning of each upkeep, put a strife counter on Crescendo of War.

Attacking creatures get +1/+0 for each strife counter on Crescendo of War.

Blocking creatures you control get +1/+0 for each strife counter on Crescendo of War.

{T}, Collect evidence 3: Add one mana of any color. Put an unlock counter on Cryptex. (To collect evidence 3, exile cards with total mana value 3 or greater from your graveyard.)

Sacrifice Cryptex: Surveil 3, then draw three cards. Activate only if Cryptex has five or more unlock counters on it.

When Perrie enters the battlefield, put a shield counter on target creature. (If it would be dealt damage or destroyed, remove a shield counter from it instead.)

Whenever Perrie attacks, target creature you control gains trample and gets +X/+X until end of turn, where X is the number of different kinds of counters among permanents you control.