Envious Trial

Burden 3 (This enters the battlefield with 4 burden counters on it. at the beginning of each upkeep, remove
a burden counter from it. Then, if it has no burden counters on it, sacrifice it.)
Whenever you remove a burden counter
from Envious Trial, put a +1/+1 counter on all creatures you don't control.
When the last burden counter is removed from
Envious Trial, convert all +1/+1 counters on creatures you don't control.