Demoniacal Wanderer

{4}{r}{r}: Humanity 2. This ability costs {1} less to
activate for each creature that died this turn. (If
this creature isn't a Human, put two -1/-1 counters
on it and it becomes a Human.)
When Demoniacal Wanderer becomes a Human, create a 6/5 red Demon Spirit creature token
named Oni of Wild Places with haste and "At the beginning of your upkeep, return a red creature
you control to its owner's hand."