Gatekeeper of Malakir 
Creature — Vampire Warrior
Kicker (You may pay an additional as you cast this spell.)
When this creature enters, if it was kicked, target player sacrifices a creature of their choice.
Legality
standardLEGALpioneerLEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL