Sentinel of the Eternal Watch 
Creature — Giant Soldier
Vigilance (Attacking doesn't cause this creature to tap.) At the beginning of combat on each opponent's turn, tap target creature that player controls.
Legality
standardNOT LEGALpioneerLEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL