All 176 Combos with Carnival of Souls

Acererak the Archlich + Carnival of Souls + Urza's Incubator + Bontu's Monument

Infinite Draw: Infinite card draw, Infinite draw triggers, Near-infinite +1/+1 counters, Near-infinite ETB, Near-infinite LTB, Near-infinite Treasure tokens, Near-infinite colored mana, Near-infinite creature tokens, Near-infinite lifegain, Near-infinite lifegain triggers, Near-infinite lifeloss, Near-infinite ventures into the dungeon, Near-infinite storm count

Cast Acererak either from your hand or from the command zone by paying {B} plus commander tax, if applicable. Bontu's Monument triggers, causing you to gain life and each opponent to lose life. When Acererak enters, its first ability and Carnival of Souls trigger. Resolve the Carnival of Souls trigger, causing you to add {B} and lose 1 life. Resolve the Acererak trigger, returning it from the battlefield to your hand, and venturing into Lost Mine of Phandelver. Repeat.