Castle of Darigaaz

Castle of Darigaaz enters the battlefield tapped
with X egg counters on it.
{t}, Remove an egg counter from Castle of
Darigaaz: Create a red, black, and green 2/2
dragon creature token with, "{b}: Regenerate this
token, {r}: This token gets +1/+0 until end of
turn, and {g}: This token gets +0/+1 until end of
turn."
Whenever you cast a Dragon creature spell, it
enters with a +1/+1 counter. It can't be
countered.