Temporal Extortion 
Sorcery
When you cast this spell, any player may pay half their life, rounded up. If a player does, counter Temporal Extortion. Take an extra turn after this one.
Legality
standardNOT LEGALpioneerNOT LEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL