Ubul Sar Gatekeepers 
Creature — Zombie Soldier
When this creature enters, if you control two or more Gates, target creature an opponent controls gets -2/-2 until end of turn.
Legality
standardNOT LEGALpioneerLEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL