Mindbreak Trap 
Instant — Trap
If an opponent cast three or more spells this turn, you may pay 
rather than pay this spell's mana cost.
Exile any number of target spells.
Legality
standardNOT LEGALpioneerNOT LEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL