Golden-Tail Trainer
From Modern Horizons 3 set
Golden-Tail Trainer
Creature — Fox Samurai
1/3
Aura and Equipment spells you cast cost less to cast, where X is this creature's power.
Whenever this creature attacks, other modified creatures you control get +X/+X until end of turn, where X is this creature's power. (Equipment, Auras you control, and counters are modifications.)