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Aven Shrine
{1}{W}{W}
Enchantment
Whenever a player casts a spell, that player gains X life, where X is the number of cards in all graveyards with the same name as that spell.
B-I-N-G-O
{1}{G}
Creature -- Dog
1/1
Trample
Whenever a player casts a spell, put a chip counter on its mana value.
~this~ gets +9/+9 for each set of three numbers in a row with chip counters on them.
Bazaar of Wonders
{3}{U}{U}
World Enchantment
When ~this~ enters, exile all graveyards.
Whenever a player casts a spell, counter it if a card with the same name is in a graveyard or a nontoken permanent with the same name is on the battlefield.
Blind Creeper
{1}{B}
Creature -- Zombie Beast
3/3
Whenever a player casts a spell, ~this~ gets -1/-1 until end of turn.
Cabal Shrine
{1}{B}{B}
Enchantment
Whenever a player casts a spell, that player discards X cards, where X is the number of cards in all graveyards with the same name as that spell.
Cephalid Shrine
{1}{U}{U}
Enchantment
Whenever a player casts a spell, counter that spell unless that player pays {X}, where X is the number of cards in all graveyards with the same name as the spell.
Checks and Balances
{2}{U}
Enchantment
Cast ~this~ only if there are three or more players in the game.
Whenever a player casts a spell, each of that player's opponents may discard a card. If they do, counter that spell.
Desecration Elemental
{3}{B}
Creature -- Elemental
8/8
Fear (~this~ can't be blocked except by artifact creatures and/or black creatures.)
Whenever a player casts a spell, sacrifice a creature.
Dwarven Shrine
{1}{R}{R}
Enchantment
Whenever a player casts a spell, ~this~ deals X damage to that player, where X is twice the number of cards in all graveyards with the same name as that spell.
Ebon Drake
{2}{B}
Creature -- Drake
3/3
Flying
Whenever a player casts a spell, you lose 1 life.
Fields of Summer
Plane -- Moag
Whenever a player casts a spell, that player may gain 2 life.
Whenever chaos ensues, you may gain 10 life.
Forgotten Ancient
{3}{G}
Creature -- Elemental
0/3
Whenever a player casts a spell, you may put a +1/+1 counter on ~this~.
At the beginning of your upkeep, you may move any number of +1/+1 counters from ~this~ onto other creatures.
Horn of Plenty
{6}
Artifact
Whenever a player casts a spell, they may pay {1}. If the player does, they draw a card at the beginning of the next end step.
Ice Cave
{3}{U}{U}
Enchantment
Whenever a player casts a spell, any other player may pay that spell's mana cost. If a player does, counter the spell. (Mana cost includes color.)
Mana Breach
{2}{U}
Enchantment
Whenever a player casts a spell, that player returns a land they control to its owner's hand.
Managorger Hydra
{2}{G}
Creature -- Hydra
1/1
Trample
Whenever a player casts a spell, put a +1/+1 counter on ~this~.
Minamo
Plane -- Kamigawa
Whenever a player casts a spell, that player may draw a card.
Whenever chaos ensues, each player may return a blue card from their graveyard to their hand.
Mirrored Depths
Plane -- Karsus
Whenever a player casts a spell, that player flips a coin. If the player loses the flip, counter that spell.
Whenever chaos ensues, target player reveals the top card of their library. If it's a nonland card, you may cast it without paying its mana cost.
Nantuko Shrine
{1}{G}{G}
Enchantment
Whenever a player casts a spell, that player creates X 1/1 green Squirrel creature tokens, where X is the number of cards in all graveyards with the same name as that spell.
Nether Void
{3}{B}
World Enchantment
Whenever a player casts a spell, counter it unless that player pays {3}.
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