Iudex Gundyr

This spell costs {1} less to cast for each creature card
in your graveyard.
Whenever a creature dealt combat damage by
Iudex Gundyr dies, exile that creature and put a corruption counter on Iudex Gundyr.
As long as Iudex Gundyr has five or more
corruption counters on it, it gets +2/+2, has menace
and trample, and is a Horror in addition to it's other
types.