The First Eldrazi

Evolve (When a creature with greater power or toughness enters, put a +1/+1 counter on it)

{2}{w}{u}{r}: Monstrosity 4(If this creature is not monstrous, put four +1/+1 counters on it and it becomes monstrous)

At the beginning of the next end step, if this creature is monstrous, you may flip it over