Two Heads, One Heart

As an additional casting cost, Sacrifice
2 Dragons and put X +1/+1 Counters
on 2 Heads, 1 Heart where X is equal
to those Dragons' total Casting Cost.
{x}{t}: Remove X +1/+1 Counters from
2 Heads, 1 Heart and put X 1/1 red, green
or white Dragon Tokens in Play.