Time Sieve + Encroaching Mycosynth + Delina, Wild Mage + Avenger of Zendikar

Time Sieve

Encroaching Mycosynth

Delina, Wild Mage

Avenger of Zendikar

How it works

1. Declare Delina as an attacker.
2. Delina triggers, creating at least one token copy of Avenger of Zendikar with haste.
3. When the Avenger of Zendikar token enters the battlefield, its first ability triggers, creating at least four 0/1 Plant creature tokens.
4. Activate Time Sieve by tapping it, sacrificing the Avenger of Zendikar token and the Plant tokens, causing you to take an extra turn after this one.
5. Repeat each turn.

This wondrous loop centers around Delina, Wild Mage, whose attack trigger summons an army of token copies. Because Encroaching Mycosynth turns all your nonland permanents into artifacts, your newly created tokens are primed for sacrifice right away. When you multiply those tokens using Avenger of Zendikar's entry trigger to flood the board with Plant creature tokens, you instantly gather the exact material needed for Time Sieve's activation cost. Sacrificing the Avenger clone and its sprouting plants allows you to seize endless extra turns, trapping your opponents in an unyielding temporal lock.