Tormented Paladin

Soul harvest (You may sacrifice any amount of Spirit creatures when you summon this creature. For every Spirit sacrificed this way, reduce this creature's summoning cost by {1} and put a Soul counter on it)
Every Soul counter on Tormented Paladin grants him +1/+1. If Tormented Paladin has four or more Soul counters on it, it has Menace. At the beginning of your upkeep, if Tormented Paladin has more than four Soul counters on it, remove counters until there are only four.