Mirrored Depths (Planechase Anthology)

Set: Oversize Cards

Rarity: Special

Type: Plane — Karsus

Whenever a player casts a spell, that player flips a coin. If he or she loses the flip, counter that spell. Whenever you roll Chaos, target player reveals the top card of his or her library. If it's a nonland card, you may cast it without paying its mana cost.