Infinite Guideline Station + Time Sieve + Soulherder

Infinite Guideline Station

Time Sieve

Soulherder

How it works

1. Cast Infinite Guideline Station either from your hand or from the command zone by paying plus commander tax if applicable.
2. When Infinite Guideline Station enters, it triggers, creating a 2/2 Robot artifact creature token for each multicolored permanent you control.
3. Activate Infinite Guideline Station's station ability by tapping any number of creatures with total power 12 or greater, putting at least twelve charge counters on Infinite Guideline Station, causing it to become a creature.
4. Activate Time Sieve by tapping it and sacrificing five Robots, causing you to take an extra turn after this one.
5. At the beginning of your end step, Soulherder triggers, blinking Infinite Guideline Station.
6. When Infinite Guideline Station enters, it and Soulherder trigger.
7. Resolve the Infinite Guideline Station trigger, creating a 2/2 Robot artifact creature token for each multicolored permanent you control.
8. Resolve the Soulherder trigger, putting a +1/+1 counter on it.
9. Repeat from step 3 each turn.

This intricate loop revolves around repeatedly resetting Infinite Guideline Station with Soulherder's end-step blink, generating a fresh crop of Robot artifact creature tokens every single turn. You can tap those newly minted tokens to fuel Infinite Guideline Station's station ability, turning it into a massive flying creature while simultaneously satisfying the steep five-artifact sacrifice requirement for Time Sieve. By perpetually feeding Time Sieve this way, you chain endless extra turns together to lock down the game completely.