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

Teshar, Ancestor's Apostle

Aether Channeler

Mana Crypt

Phyrexian Altar

How it works

1. Activate Mana Crypt by tapping it, adding CC.
2. Activate Phyrexian Altar by sacrificing Aether Channeler, adding one mana of any color.
3. Cast the historic permanent from your hand by paying its mana cost.
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 Phyrexian Altar by sacrificing Aether Channeler, adding one mana of any color.
7. Cast Mana Crypt by paying 1.
8. Teshar triggers, returning Aether Channeler from your graveyard to the battlefield.
9. When Aether Channeler enters the battlefield, it triggers, returning the historic permanent cast in step 3 from the battlefield to your hand.
10. Activate Phyrexian Altar by sacrificing Aether Channeler, adding one mana of any color.
11. Repeat from step 3.