Fushiguro Megumi

At the beginning of each end step, for every
creature that entered that battlefield under your control without you casting it, put that many
shadow counters on Megumi, then if Megumi
has 5 or more shadow counters, transform him,
otherwise choose one:
•Create two 1/1 white Rabbit creature tokens with lifelink.
•Create a 1/3 black Frog creature token with reach.
•Create a 3/2 black Dog creature token.