When Survey Mechan dies, Mortuary triggers, putting Survey Mechan from your graveyard onto the top of your library.
Chalk Outline triggers, creating two creature tokens and two Clue tokens
Resolve the Survey Mechan ability, dealing 3 damage to any target and causing you to draw three cards and gain 3 life.
Activate Ashnod's Altar twice by sacrificing the two creature tokens, adding CCCC.
Cast Survey Mechan by paying 4.
Repeat.
This delightful engine feeds on the recursive doom of Survey Mechan, which conveniently tucks itself right back onto the top of your library via Mortuary whenever it meets its end. Ashnod's Altar provides the mana needed to recast the Mechan by sacrificing the tokens left behind, turning every death into cold, hard currency. Meanwhile, Chalk Outline spots Survey Mechan leaving the graveyard and doubles down on your rewards, while Adrix and Nev, Twincasters steps in to multiply every resulting Detective and Clue token into an overwhelming surplus.