Teenage Mutant Ninja Turtles

Commander ninjutsu {u}{b}{g}
Whenever you ninjutsu a creature, instead of returning the unblocked creature to your hand,
you may mutate the ninjutsuing creature onto it.
When Teenage Mutant Ninja Turtles deals
combat damage to a player, you may reveal a
creature card from you hand with mutate. If you
do, that creature gains ninjutsu. Its ninjutsu cost
is equal to its mutate cost.