Time Sieve + Encroaching Mycosynth + Rotlung Reanimator + Conspiracy

Time Sieve

Encroaching Mycosynth

Rotlung Reanimator

Conspiracy

How it works

1. Activate Time Sieve by tapping it and sacrificing five other creatures.
2. When the creatures die as Clerics due to Conspiracy, Rotlung Reanimator triggers five times, creating five 2/2 Zombie creature tokens.
3. Resolve the Time Sieve ability, causing you to take an extra turn after this one.
4. Repeat each turn.

This ingenious loop relies on a clever type-shifting foundation: Encroaching Mycosynth turns all your nonland permanents into artifacts, while Conspiracy names "Cleric" to ensure every creature you control is also a Cleric. That shared identity means that whenever you sacrifice creatures to fuel Time Sieve's extra-turn ability, Rotlung Reanimator sees them die and promptly floods your board with five Zombie tokens. Because Encroaching Mycosynth makes those new Zombies artifacts as well, you immediately have the exact fodder required to pay Time Sieve's cost again on the very next turn.