Shivan Canyon Drake

Flying
Whenever you cast a historic spell, you may pay {u/r}. If you do, put an +1/+1 counter on this
creature.
{u}{r}, {t}, Remove X +1/+1 counters on up to
two Shivan Canyon Drakes you control: Copy
target instant or sorcery spell with converted
mana cost X. You may choose new targets for
the copy.