Ertai's Scorn 
Instant
This spell costs less to cast if an opponent cast two or more spells this turn.
Counter target spell.
Legality
standardNOT LEGALpioneerLEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL
Instant
This spell costs less to cast if an opponent cast two or more spells this turn.
Counter target spell.