Yamir, Twisted Visionary

Yamir, Twisted Visionary enters the battlefield
with X +1/+1 counters on it, where X is the
amount of mana spent to cast it.
{3}, Sacrifice another creature with a +1/+1
counter on it: Each opponent loses life equal to
the sacrificed creature's power and you draw a
card.
Pay 10 life, {t}: Put five +1/+1 counters on each creature you control.