Delta, Cleanser of Mirrodin

All Myr creatures you control gain +1/+1.
Whenever a creature you control destroys a
Phirexian creature, put a +1/+1 counter
and a Hope counter on Delta.
{t}: Exile target Myr, it returns to it's owner's
battlefield at the end of turn, put a Hope counter
on Delta, then if there are 5 or more Hope
counters on Delta, transform.
"We... must... survive" - Delta, as their planar spark approached ignition