Serra Bestiary is a common Enchantment — Aura card from Homelands (HML), collector number 15. Current market price: $0.16, TCGplayer market prices via Scryfall.
Enchant creature At the beginning of your upkeep, sacrifice this Aura unless you pay {W}{W}. Enchanted creature can't attack or block, and its activated abilities with {T} in their costs can't be activated.