Time Sieve + Encroaching Mycosynth + Bishop of Wings + Conspiracy

Time Sieve

Encroaching Mycosynth

Bishop of Wings

Conspiracy

How it works

1. Activate Time Sieve by tapping it and sacrificing five other creatures.
2. When the creatures die as Angels due to Conspiracy, Bishop of Wings' second ability triggers five times.
3. Resolve the first trigger, causing you to create a 1/1 Spirit creature token.
4. When the Spirit enters the battlefield as an Angel due to Conspiracy, Bishop of Wings' first ability triggers, causing you to gain 4 life.
5. Repeat from step 3 for each remaining trigger.
6. Resolve the Time Sieve ability from step 1, causing you to take an extra turn after this one.
7. Repeat each turn.

This intricate loop turns the battlefield into an engine for infinite time by leveraging continuous type-shifting effects. With Conspiracy naming "Angel" and Encroaching Mycosynth turning all your nonland permanents into artifacts, every creature you control becomes both an Angel and an artifact. You tap Time Sieve and sacrifice five of these creatures, which triggers Bishop of Wings to spawn five Spirit tokens upon their death. Because those newly created Spirits instantly enter the battlefield as Angels, Bishop of Wings triggers again to grant you a massive influx of life while generating the exact fodder needed to feed Time Sieve for another extra turn.