Aldor, the Twisting Image

Vigilance, Reach, Intimidate
Aldor, the Twisting Image costs {1} less for each creature you have in your graveyard.
{5}: Aldor becomes your choice of a white 4/4 bird with flying, a black 5/5 illusion with deathtouch, or a green 6/6 beast with trample.
You can do this ability only once and on your turn.