Requires

Teshar, Ancestor's Apostle must be on the battlefield. Aether Channeler must be on the battlefield. Mana Crypt must be on the battlefield. Ashnod's Altar must be on the battlefield. You have a historic permanent card in hand that can be cast using . Mana needed: if the permanent requires five or more mana to cast

Steps

1. Activate Mana Crypt by tapping it, adding .
2. Activate Ashnod's Altar by sacrificing Aether Channeler, adding .
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 Ashnod's Altar by sacrificing Aether Channeler, adding .
7. Cast Mana Crypt by paying .
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 Ashnod's Altar by sacrificing Aether Channeler, adding .
11. Repeat from step 3.

Results