Mindbreak Trap [Zendikar]

Set: Zendikar Type: Instant — Trap Mythic Cost: {2}{U}{U} If an opponent cast three or more spells this turn, you may pay {0} rather than pay this spell's mana cost. Exile any number of target spells. "Life is a maze. This is one of its dead ends." —Noyan Dar, Tazeem lullmage