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 magnificent transmutation engine relies on Mortuary to intercept Survey Mechan the moment it hits the graveyard, returning the avian constructor straight to the top of your library so you can endlessly redraw and recast it. Meanwhile, Chalk Outline watches Survey Mechan leave your graveyard, flooding the board with Detective tokens and Clues that are immediately fed to Ashnod's Altar for the mana required to keep the loop spinning. To push this reaction past its theoretical limits, Doubling Season steps in to multiply every single token produced by Chalk Outline, generating an explosive surplus of artifacts and creatures to fuel Ashnod's Altar with mana to spare.