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Ammit Eternal
{2}{B}
Creature -- Zombie Crocodile Demon
5/5
Afflict 3 (Whenever this creature becomes blocked, defending player loses 3 life.)
Whenever an opponent casts a spell, put a -1/-1 counter on ~this~.
Whenever ~this~ deals combat damage to a player, remove all -1/-1 counters from it.
Chancellor of the Annex
{4}{W}{W}{W}
Creature -- Phyrexian Angel
5/6
You may reveal this card from your opening hand. If you do, when each opponent casts their first spell of the game, counter that spell unless that player pays {1}.
Flying
Whenever an opponent casts a spell, counter it unless that player pays {1}.
Counterbalance
{U}{U}
Enchantment
Whenever an opponent casts a spell, you may reveal the top card of your library. If you do, counter that spell if it has the same mana value as the revealed card.
Decree of Silence
{6}{U}{U}
Enchantment
Whenever an opponent casts a spell, counter that spell and put a depletion counter on ~this~. If there are three or more depletion counters on ~this~, sacrifice it.
Cycling {4}{U}{U} ({4}{U}{U}, Discard this card: Draw a card.)
When you cycle ~this~, you may counter target spell.
Dragonlair Spider
{2}{R}{R}{G}{G}
Creature -- Spider
5/6
Reach
Whenever an opponent casts a spell, create a 1/1 green Insect creature token.
Forced Fruition
{4}{U}{U}
Enchantment
Whenever an opponent casts a spell, that player draws seven cards.
Hunting Grounds
{G}{W}
Enchantment
Threshold -- As long as seven or more cards are in your graveyard, ~this~ has "Whenever an opponent casts a spell, you may put a creature card from your hand onto the battlefield."
Ishai, Ojutai Dragonspeaker
{2}{W}{U}
Legendary Creature -- Bird Monk
1/1
Flying
Whenever an opponent casts a spell, put a +1/+1 counter on ~this~.
Partner (You can have two commanders if both have partner.)
Kaervek the Merciless
{5}{B}{R}
Legendary Creature -- Human Shaman
5/4
Whenever an opponent casts a spell, ~this~ deals damage equal to that spell's mana value to any target.
Lurking Predators
{4}{G}{G}
Enchantment
Whenever an opponent casts a spell, reveal the top card of your library. If it's a creature card, put it onto the battlefield. Otherwise, you may put that card on the bottom of your library.
Memory Erosion
{1}{U}{U}
Enchantment
Whenever an opponent casts a spell, that player mills two cards.
Modular Monstrosity
{7}
Artifact Creature -- Construct
3/3
Whenever an opponent casts a spell, you have five seconds to choose a keyword you haven't chosen for a card named Modular Monstrosity today that's been printed on a creature card. If you do, ~this~ gains that ability. Otherwise, ~this~ loses all keyword abilities.
Mogg Sentry
{R}
Creature -- Goblin Warrior
1/1
Whenever an opponent casts a spell, ~this~ gets +2/+2 until end of turn.
Painful Quandary
{3}{B}{B}
Enchantment
Whenever an opponent casts a spell, that player loses 5 life unless they discard a card.
Perplexing Chimera
{4}{U}
Enchantment Creature -- Chimera
3/3
Whenever an opponent casts a spell, you may exchange control of ~this~ and that spell. If you do, you may choose new targets for the spell. (If the spell becomes a permanent, you control that permanent.)
Rhystic Study
{2}{U}
Enchantment
Whenever an opponent casts a spell, you may draw a card unless that player pays {1}.
Spelltithe Enforcer
{3}{W}{W}
Creature -- Elephant Wizard
3/3
Whenever an opponent casts a spell, that player sacrifices a permanent unless they pay {1}.
Sunscorch Regent
{3}{W}{W}
Creature -- Dragon
4/3
Flying
Whenever an opponent casts a spell, put a +1/+1 counter on ~this~ and you gain 1 life.
Taurean Mauler
{2}{R}
Creature -- Shapeshifter
2/2
Changeling (This card is every creature type.)
Whenever an opponent casts a spell, you may put a +1/+1 counter on ~this~.
Tovolar's Magehunter
Creature -- Werewolf
5/5
Whenever an opponent casts a spell, ~this~ deals 2 damage to that player.
At the beginning of each upkeep, if a player cast two or more spells last turn, transform ~this~.
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