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Chalice of the Void
{X}{X}
Artifact
~this~ enters with X charge counters on it.
Whenever a player casts a spell with mana value equal to the number of charge counters on ~this~, counter that spell.
Common Courtesy
{2}{U}{U}
Enchantment
Whenever a player casts a spell without asking your permission while casting it, counter that spell.
When a player asks you permission to cast a spell and you refuse, counter that spell and sacrifice ~this~.
Dovescape
{3}{W/U}{W/U}{W/U}
Enchantment
({w/u} can be paid with either {W} or {U}.)
Whenever a player casts a noncreature spell, counter that spell. That player creates X 1/1 white and blue Bird creature tokens with flying, where X is the spell's mana value.
Erayo, Soratami Ascendant
{1}{U}
Legendary Creature -- Moonfolk Monk
1/1
Flying
Whenever the fourth spell of a turn is cast, flip ~this~.
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~this~'s Essence
Legendary Enchantment
Whenever an opponent casts their first spell each turn, counter that spell.
Jace, Unraveler of Secrets
{3}{U}{U}
Legendary Planeswalker -- Jace
5
[+1]: Scry 1, then draw a card.
[-2]: Return target creature to its owner's hand.
[-8]: You get an emblem with "Whenever an opponent casts their first spell each turn, counter that spell."
Lavinia, Azorius Renegade
{W}{U}
Legendary Creature -- Human Soldier
2/2
Each opponent can't cast noncreature spells with mana value greater than the number of lands that player controls.
Whenever an opponent casts a spell, if no mana was spent to cast it, counter that spell.
Nullstone Gargoyle
{9}
Artifact Creature -- Gargoyle
4/5
Flying
Whenever the first noncreature spell of a turn is cast, counter that spell.
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