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IMMG54 It's a bit hard to explain.
What you are going to want to have in the end is two Mnemonic Wall to then Ghostly Flicker them both to generate infinite mana via Songs of the Damned with Blood Celebrant. With that set up you can either Gain infinite life via Gnaw to the Bone and cast every creature in your deck using Death Denied for a next turn lethal swing or go the easy route and just cast Drain Life for their life total.
Now I know that all seems like a lot but it can happen turn three or four, it can also be done with only one mana which is pretty cool, given you have the correct cards in hand. I can see it biggest downside being enchantment removal because Tortured Existence is the absolute key in this deck.