Crashing Wave is a uncommon Sorcery card from Avatar: The Last Airbender (TLA), collector number 300. Current market price: $0.28 (foil $0.38), TCGplayer market prices via Scryfall.
As an additional cost to cast this spell, waterbend {X}. (While paying a waterbend cost, you can tap your artifacts and creatures to help. Each one pays for {1}.) Tap up to X target creatures, then distribute three stun counters among any number of tapped creatures your opponents control. (If a permanent with a stun counter would become untapped, remove one from it instead.)