Xer, the last dragon

Xer, the last dragon enters the battlefield with 5
dragon counters.
{2}{r/g} take of 1 dragon counter:
crate A 5/5 red dragon token with flying.
{4}{b}{r} take of 3 dragon counter:
make a copy of Xer, the last dragon with 10 dragon counters on It.
You can only use this ability once