Be'lakor, the Dark Master + Dread Slaver + Conspiracy + Ashnod's Altar

Be'lakor, the Dark Master

Dread Slaver

Conspiracy

Ashnod's Altar

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. Activate Ashnod's Altar by sacrificing Dread Slaver, adding CC.
4. When Dread Slaver dies, it triggers, returning itself from your graveyard to the battlefield.
5. Repeat from step 2.

This ingenious loop transforms your entire battlefield into a recursive engine, fueled entirely by keyword-altering magic and lethal self-inflicted damage. By having Conspiracy name "Demon," every creature you control becomes a Demon, allowing Be'lakor, the Dark Master to trigger whenever Dread Slaver enters the battlefield and shoot it for lethal damage. Because Dread Slaver dealt that damage, its own trigger brings it straight back to the battlefield whenever it dies, while Ashnod's Altar stands ready to sacrifice it for a steady stream of colorless mana in the meantime.