Warrior's Oath 
Sorcery
Take an extra turn after this one. At the beginning of that turn's end step, you lose the game.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL
Sorcery
Take an extra turn after this one. At the beginning of that turn's end step, you lose the game.