
Whenever a player casts an instant spell, counter it unless that player pays {X}, where X is its mana value.
In the Eye of Chaos has 2 printings, first in Legends (1994). EDHREC ranks it #21,529 among Commander cards. It appears most in Trelane, Squire of Gothos decks (1 on EDHREC). It has 2 official rulings.
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.