Combos Utilizing Carnival-of-Souls

play conspiracy naming cleric. rotlung produces 2/2 cleric creatures. sac a cleric to archon. opponent loses 2 life, you lose 0 life & gain 1 b mana. sac cleric token from rotlung to archon. repeat

one mancer in graveyard, other in play. sac mancer in play to return mancer in graveyard to play. wake's life gain offsets carnival's life loss. add second carnival to gain infinite black mana

Now your opponent takes the damage, and more than likely mana burn to boot.

Have Braidwood Cup and Carnival of Souls in play. Tap the Cup to get back the life you lose from Carnival of Souls when a creature enters plays.

Have Fountain of Youth and Carnival of Souls in play. Tap Fountain of Youth to get back the life you lose from Carnival of Souls when a creature enters plays.

donate souls to opponent. very upkeepeach player puts a 2/2 token into play for each creature in his graveyard. opponent loses 1 life for each token coming into play. repeat during next players upkeep

Donate the Carnival of Souls to your opponent, then play Sliver Queen and the Heartstone, tap 1 land to use the Sliver Queen's ability to do 2 damage to your opponent, then repeat.

You need 2 Wakes, Necromancer and Carnival on table, and one more Necromancer in graveyard. Get Necromancer, lose one live, get one mana and get 2 live, repeat.

play evolution-change zombie creature on rotlung to cleric creature. sac a cleric to archon. opponent loses 2 life, you lose 0 life & gain 1 b mana. sac cleric token from rotlung to archon. repeat

This combo also needs Urza's Armor. The cockroaches come into play for 3 mana, triggering the carnival to produce B and carnivals damage is blocked by armor. Sac the roaches to the altar for 2 repeat