Domir, Mad Biomancer

Partners with Bglthp, Creeping Horror (When this creature enters the battlefield, target player may put
Bglthp, Creeping Horror into their hand from their library, then shuffle.)
Whenever an opponent discards a card, put a
+1/+1 counter on each creature you control.
Each creature card you own that isn't on the battlefield has madness. The madness cost is
equal to its mana cost.