Davion

{g}: Davion becomes a 2/2 Green Dragon. Put a
Flying counter on it.
{g}{r}: If Davion is a Green Dragon, it becomes a
3/3 Red Dragon. Put a Trample counter on it.
{g}{r}{u}: If Davion is a Red Dragon, it becomes a
4/4 Blue Dragon. Put a Menace counter on it.
{g}{r}{u}{b}: If Davion is a Blue Dragon, put a
+1/+1 counter on it and it gains "Whenever
Davion kills a Dragon, put 4 +1/+1 counters
on it.