Serra Bestiary 
Enchantment — Aura
Enchant creature
At the beginning of your upkeep, sacrifice this Aura unless you pay .
Enchanted creature can't attack or block, and its activated abilities with 
in their costs can't be activated.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL