Eldunari, Heart of Hearts

Imprint Dragon (When Eldunari, Heart of Hearts
enters the battlefield, you may exile a dragon
creature.)
{t}: Add one mana of any color, if you imprinted a
creature as this entered, add mana equal to the
exiled creatures power instead.
{4}, {t}: Put a token onto the battlefield that's a copy
of the exiled card. Its a spirit in addition to its other
types and gains haste. Exile it at the beginning of the
next end step.