Bedlam Reveler is a rare Creature — Devil Horror card from Eldritch Moon (EMN), collector number 118. Current market price: $0.20 (foil $0.30), TCGplayer market prices via Scryfall.
This spell costs {1} less to cast for each instant and sorcery card in your graveyard. Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.) When this creature enters, discard your hand, then draw three cards.