Mortuary + Bolas's Citadel + Phyrexian Dreadnought + Funeral Room // Awakening Hall

Mortuary

Bolas's Citadel

Phyrexian Dreadnought

Funeral Room // Awakening Hall

How it works

1. Cast Phyrexian Dreadnought from the top of your library by paying 1 life.
2. When Phyrexian Dreadnought enters, it triggers, causing you to sacrifice it.
3. When Phyrexian Dreadnought dies, Mortuary and Funeral Room trigger.
4. Resolve the Mortuary trigger, putting Phyrexian Dreadnought from your graveyard onto the top of your library.
5. Resolve the Funeral Room trigger, causing you to gain 1 life and each opponent to lose 1 life.
6. Repeat.