Cortal, Simic Evolutionary

Evolve (Whenever a creature enters the battlefield under your control, if that creature has greater power or toughness than this creature, put a +1/+1 counter on this creature.)
Whenever a +1/+1 counter is placed on Cortal, the Simic Evolutionary, Put a +1/+1 counter on each other creature you control.
Creatures you control with +1/+1 counters on them have Hexproof.