Zekalus, the prophet

Creatures you control get Persist, creatures your opponents control have "whenever counters of any kind are put on this creature put a 1/1 green insect creature token onto the battlefield under each opponent control".
Whenever an insect enters the battlefield under your control you may gain 1 life.
"I may just be another Plagued but I feel the plague in me... it makes me alive... I want to share my gift with you"