Survey Mechan + Mortuary + Ashnod's Altar + Insidious Roots + Anointed Procession

Survey Mechan

Mortuary

Ashnod's Altar

Insidious Roots

Anointed Procession

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. Insidious Roots triggers, creating two creature tokens and putting a +1/+1 counter on each Plant you control.
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 fascinating engine loops Survey Mechan by leveraging Mortuary to stack the creature right back onto your library whenever it dies. Ashnod's Altar provides the colorless mana needed to recast it, while Insidious Roots capitalizes on Survey Mechan leaving the graveyard to spawn Plant tokens. Because Anointed Procession doubles those token creations, sacrificing the resulting Plant tokens to Ashnod's Altar yields extra mana to sustain the loop while rapidly growing your botanical army with +1/+1 counters.