Survey Mechan + Mortuary + Ashnod's Altar + Kaya, Geist Hunter + Skeleton Crew

Survey Mechan

Mortuary

Ashnod's Altar

Kaya, Geist Hunter

Skeleton Crew

How it works

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

This intricate loop uses Mortuary as a recycling conveyor belt, ensuring Survey Mechan returns right to the top of your library every time it is sacrificed to Ashnod's Altar. Meanwhile, Skeleton Crew watches those creature cards leave your graveyard, flooding the board with tokens whose production is doubled thanks to Kaya, Geist Hunter's -2 ability. You then sacrifice those generated tokens back to Ashnod's Altar to fund casting Survey Mechan again, while Skeleton Crew also serves double duty by passively boosting your creature tokens as Skeletons and Pirates.