Magma Opus is a mythic Instant card from Tarkir: Dragonstorm Commander (TDC), collector number 296. Current market price: $0.27, TCGplayer market prices via Scryfall.
Magma Opus deals 4 damage divided as you choose among any number of targets. Tap two target permanents. Create a 4/4 blue and red Elemental creature token. Draw two cards. {U/R}{U/R}, Discard this card: Create a Treasure token.