Deadly Alliance is a common Instant card from Zendikar Rising (ZNR), collector number 96. Current market price: $0.16 (foil $0.24), TCGplayer market prices via Scryfall.
This spell costs {1} less to cast for each creature in your party. (Your party consists of up to one each of Cleric, Rogue, Warrior, and Wizard.) Destroy target creature or planeswalker.