Call of the Full Moon is a uncommon Enchantment — Aura card from Magic Origins (ORI), collector number 134. Current market price: $0.07 (foil $0.42), TCGplayer market prices via Scryfall.
Enchant creature Enchanted creature gets +3/+2 and has trample. (It can deal excess combat damage to the player or planeswalker it's attacking.) At the beginning of each upkeep, if a player cast two or more spells last turn, sacrifice this Aura.