Survey Mechan + Mortuary + Ashnod's Altar + Doubling Season + Teval, the Balanced Scale

Survey Mechan

Mortuary

Ashnod's Altar

Doubling Season

Teval, the Balanced Scale

How it works

1. Activate Survey Mechan by sacrificing it.
2. When Survey Mechan dies, Mortuary triggers, putting Survey Mechan from your graveyard onto the top of your library.
3. Teval triggers, creating two creature tokens.
4. Resolve the Survey Mechan ability, dealing 3 damage to any target and causing you to draw three cards and gain 3 life.
5. Activate Ashnod's Altar twice by sacrificing the two creature tokens, adding CCCC.
6. Cast Survey Mechan by paying 4.
7. Repeat.

This intricate loop centers around sacrificing Survey Mechan to Ashnod's Altar to fund its casting cost while generating mana, while Mortuary steps in to bypass the graveyard and place Survey Mechan directly back on top of your library for the next draw step. Meanwhile, Teval, the Balanced Scale acts as a brilliant bridge, turning any card leaving the graveyard into a token generation event that Doubling Season multiplies into a pair of 2/2 black Zombie Druid creature tokens. Sacrificing those empowered tokens back to Ashnod's Altar yields the necessary colorless mana to replay Survey Mechan, sustaining an endless cascade of damage, card draw, and lifegain.