Thundering Raiju is a rare Creature — Spirit card from Kamigawa: Neon Dynasty (NEO), collector number 472. Current market price: $0.48 (foil $1.40), TCGplayer market prices via Scryfall.
Haste Whenever this creature attacks, put a +1/+1 counter on target creature you control. Then this creature deals X damage to each opponent, where X is the number of modified creatures you control other than this creature. (Equipment, Auras you control, and counters are modifications.)