Overmaster 
Sorcery
The next instant or sorcery spell you cast this turn can't be countered. Draw a card.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL
Sorcery
The next instant or sorcery spell you cast this turn can't be countered. Draw a card.