Encroaching Mycosynth + Time Sieve + Xathrid Necromancer + Xenograft

UB identity

Commander legal

The 4 combo pieces

• Encroaching Mycosynth
• Time Sieve
• Xathrid Necromancer
• Xenograft

What must be in place

You control at least five other creatures.
"Human" chosen with Xenograft.

How to execute it

1. Activate Time Sieve by tapping it and sacrificing five other creatures.
2. When the creatures die as Humans due to Xenograft, Xathrid Necromancer 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.

What the combo produces

• Infinite turns
• Lock