Thundering Sparkmage is a uncommon Creature — Human Wizard card from The List (PLST), collector number ZNR-171. Current market price: $0.11, TCGplayer market prices via Scryfall.
When this creature enters, it deals X damage to target creature or planeswalker, where X is the number of creatures in your party. (Your party consists of up to one each of Cleric, Rogue, Warrior, and Wizard.)