Be'lakor, the Dark Master + Dread Slaver + Conspiracy + Archetype of Finality

Be'lakor, the Dark Master

Dread Slaver

Conspiracy

Archetype of Finality

How it works

1. Cast Dread Slaver by paying 3.
2. When Dread Slaver enters the battlefield, Be'lakor's second ability triggers, causing Dread Slaver to deal damage equal to its power to itself.
3. Dread Slaver dies as a state-based action due to its deathtouch.
4. Dread Slaver triggers, returning itself from your graveyard to the battlefield.
5. Repeat from step 2.