Ren Zhihao, Bowmaster Sifu

Flash
Whenever Ren Zhihao enters the battlefield or
another creature you control trains, you may
exile target instant card with mana value less than
or equal to that creature's power from your
graveyard. Copy that instant card. You may cast
the copy without paying its mana cost.
Whenever you cast an instant spell from your
hand, create a 1/1 Warrior token with training
that's all colors.