Sakura, Ansatsuken Prodigy

Whenever you put a +1/+1 counter on
another creature you control, you may pay
{1}. If you do so, put a +1/+1 counter on
Sakura, Ansatsuken Prodigy.
Discard a card, {1}{r}, {t}: Sakura, Ansatsuken
Prodigy deals 2 damage to target creature.
"I'm only gonna get stronger!"