Cocoon Spider

Reach
Whenever Cocoon Spider blocks a creature, exile
that creature and Cocoon Spider.
At the beginning of your upkeep, if Cocoon
Spider is in exile, put a -1/-1 counter on each
card exiled with it with toughness 1 or greater
and that many +1/+1 counters on Cocoon Spider.
You may cast Cocoon Spider from exile as long as
cards exiled with it have total toughness 0 or less.
Counters remain on Cocoon Spider as it moves to
any zone other than a hand or library.