Manacles of Decay 
Enchantment — Aura
Enchant creature
Enchanted creature can't attack.
: Enchanted creature gets -1/-1 until end of turn.
: Enchanted creature can't block this turn.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL