Loose Ends

Burden 4 (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 Loose Ends, sacrifice target
creature you control.
When the last burden counter is removed from
Loose Ends, target creature gains the abilities of
all creature spells in your graveyard.