Activate Shilgengar by sacrificing Aether Channeler
Activate Mana Crypt by tapping it, adding CC.
Cast the other artifact with MV<=2 by paying at most 2.
Teshar triggers, returning Aether Channeler from your graveyard to the battlefield.
When Aether Channeler enters the battlefield, it triggers, returning Mana Crypt from the battlefield to your hand.
Activate Shilgengar by sacrificing Aether Channeler
Cast Mana Crypt by paying 0.
Teshar triggers, returning Aether Channeler from your graveyard to the battlefield.
When Aether Channeler enters the battlefield, it triggers, returning the other artifact from the battlefield to your hand.
Repeat.
This vintage loop relies on Teshar, Ancestor's Apostle as your engine, triggering its graveyard recursion every time you cast a historic spell like Mana Crypt. To keep the chain going, Aether Channeler bounces your artifacts back to your hand as it enters the battlefield, allowing you to recast them endlessly. Meanwhile, Shilgengar, Sire of Famine stands ready to sacrifice creatures for Blood tokens when you need to transition your loop or rebuild your board, turning your continuous casting into an infinite cascade of triggers.