Kardis, Enigmatic Mirage

Changeling
Whenever a creature you control enters the battlefield, make a copy of it except it gains changeling.
{r}{g}{u}: Kardik, Enigmatic Mirage becomes the copy of target creature an opponent controls until end of turn. It would gain that creature's abilities, power, and toughness. If the ability costs mana, choose a color and that mana becomes
that color instead.