Prodigious Spawn

{1}{r}: Prodigious Spawn becomes a 2/2 Dinosaur
with Menace.
{3}{g}: If Prodigious Spawn is a Dinosaur, it
becomes a 6/6 Dinosaur Avatar with Trample
and Menace.
{5}{w}: If Prodigious Spawn is an Avatar, it
becomes a 9/9 Elder Dinosaur Avatar with Vigilance, Trample, and Menace.