Karlov of the Ghost Council Combos
Agatha's Soul Cauldron + Spike Feeder + Karlov of the Ghost Council
Karlov of the Ghost Council + Animation Module + Ajani's Welcome
Combo result
Infinite creature tokens. Infinite colorless mana. Infinite +1/+1 counters on Karlov. Infinite ETB. Infinite LTB. Infinite death triggers. Infinite sacrifice triggers. Infinite lifegain. Infinite lifegain triggers.
Prerequisites
All permanents on the batltefield. You have a way to cause a creature to enter the battlefield under your control.