Thundering Raiju
From Kamigawa: Neon Dynasty set
Thundering Raiju
Creature — Spirit
3/3
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.)