Ashnod's Altar + Mentor of the Meek + Cryptcaller Chariot

Ashnod's Altar

Mentor of the Meek

Cryptcaller Chariot

How it works

1. During your cleanup step, discard cards down to your maximum hand size.
2. Cryptcaller Chariot triggers, creating a number of tapped 2/2 Zombie creature tokens equal to the number of cards you discarded.
3. When the Zombie(s) enter, Mentor of the Meek triggers that many times.
4. Holding priority, activate Ashnod's Altar by sacrificing a Zombie, adding CC.
5. Resolve the first Mentor of the Meek trigger, causing you to pay 1 to draw a card.
6. Resolve all remaining Mentor of the Meek triggers, as applicable, choosing not to pay.
7. As it's still your cleanup step, you will again discard cards down to your maximum hand size.
8. Repeat from step 2.

This ingenious cleanup-step loop lets you turn an overflowing hand into a self-sustaining engine by exploiting the special rules of the discard phase. When you discard down to your maximum hand size, Cryptcaller Chariot triggers to flood the board with tapped 2/2 Zombies, which immediately feed Ashnod's Altar for a steady stream of colorless mana. Meanwhile, Mentor of the Meek watches these small bodies enter the battlefield, providing the exact funds needed to keep drawing cards—which in turn fuels the loop right back into another cleanup step discard.