Garnagol, Collector of Rot

Whenever Garnagol, Collector of Rot enters
the Battlefield, Create X 1/1 Insect creatures
with Flying. If you control 8 or more lands that
produce Black or Green Mana, Non-token
creatures you control gain "Whenever this
creature is destroyed or exiled, return it to the
battlefield at the beginning of your next end step"
Token creatures you control Gain Wither