Teshar, Ancestor's Apostle + Aether Channeler + Mana Crypt + Altar of Dementia

Teshar, Ancestor's Apostle

Aether Channeler

Mana Crypt

Altar of Dementia

How it works

1. Activate Altar of Dementia by sacrificing Aether Channeler, causing target player to mill cards equal to Aether Channeler's power.
2. Activate Mana Crypt by tapping it, adding CC.
3. Cast the other artifact with MV<=2 by paying at most 2.
4. Teshar triggers, returning Aether Channeler from your graveyard to the battlefield.
5. When Aether Channeler enters the battlefield, it triggers, returning Mana Crypt from the battlefield to your hand.
6. Activate Altar of Dementia by sacrificing Aether Channeler, causing target player to mill cards equal to Aether Channeler's power.
7. Cast Mana Crypt by paying 0.
8. Teshar triggers, returning Aether Channeler from your graveyard to the battlefield.
9. When Aether Channeler enters the battlefield, it triggers, returning the other artifact from the battlefield to your hand.
10. Repeat.

This loop turns your graveyard into a revolving door of recurring value, fueled by the explosive, free mana of Mana Crypt. As you continuously replay cheap artifacts to trigger Teshar, Ancestor's Apostle, you bring back Aether Channeler over and over to bounce and replay your setup pieces. Every iteration of this cycle lets Altar of Dementia grind your opponents' libraries away through infinite creature sacrifices.