MTG >Combos >Cathars' Crusade +Twilight Shepherd +Ashnod's Altar +

With all cards in play, sacrifice Twilight Shepherd to add two mana Persist's ability will trigger, returning Twilight Shepherd to play with a -1/-1 counter Cathars' Crusade's ability will trigger, putting a +1/+1 counter on each creature you control. +1/+1 and -1/-1 counters nullify each other. Repeat the process for infinite mana