Novah, Archbiomancer

Whenever a card you control mutates, create a
1/1 blue bird mutant creature token with flying
and mutate {1}{u}, a 1/1 red dinosaur mutant
creature token with first strike and mutate {1}{r}, or a 1/1 green beast mutant creature token
with trample and mutate {1}{g}.
You may pay the mutate cost of unmutated
creatures you control to exile them and return
them to the battlefield mutated.