Curse of Inertia 
Enchantment — Aura Curse
Enchant player Whenever a player attacks enchanted player with one or more creatures, that attacking player may tap or untap target permanent of their choice.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL