Zaritodian Bird

{4}{w/b}: Zaritodian Bird becomes a 7/7 bird fighter with flying and hexproof.
{6}{w/b}{r/g}: If Zaritodian Bird is a bird fighter, it becomes a 9/9 bird warrior with lifelink.
{8}{w}{b}{r}{g}: If Zaritodian Bird is a bird warrior, it becomes a 12/12 bird spirit with trample.