Thunderwave is a uncommon Sorcery card from The List (PLST), collector number CLB-201. Current market price: $0.18, TCGplayer market prices via Scryfall.
Roll a d20. 1—9 | Thunderwave deals 3 damage to each creature. 10—19 | You may choose a creature. Thunderwave deals 3 damage to each creature not chosen this way. 20 | Thunderwave deals 6 damage to each creature your opponents control.