Sleeper Agent 
Creature — Phyrexian Minion
When this creature enters, target opponent gains control of it. At the beginning of your upkeep, this creature deals 2 damage to you.
Legality
standardNOT LEGALpioneerNOT LEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL