An-Havva Knight

Aether Strike (If this creature blocks or becomes
blocked, it gets +1/+1 for each of its colors until end
of turn.)
Morph {x}{g}{g} (You may cast this card face down
as a 2/2 colorless creature for {3}. Turn it face up
anytime for its morph cost.)
An-Havva Knight becomes the color(s) of the
mana used to pay its Morph cost. (This effect lasts indefinitely.)