Time Sieve + Encroaching Mycosynth + Rionya, Fire Dancer + Avenger of Zendikar

Time Sieve

Encroaching Mycosynth

Rionya, Fire Dancer

Avenger of Zendikar

How it works

1. At the beginning of your combat phase, Rionya triggers, creating at least one token copy of Avenger of Zendikar with haste.
2. When the Avenger of Zendikar token enters the battlefield, its first ability triggers, creating at least four 0/1 Plant creature tokens.
3. 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.
4. Repeat each turn.

This intricate engine transforms your army into an infinite timeline by turning your entire board into fuel for Time Sieve. The linchpin of the strategy is Encroaching Mycosynth, whose passive ability ensures that all your nonland permanents count as artifacts, allowing Avenger of Zendikar and the Plant tokens it spawns to satisfy Time Sieve's sacrifice cost. Meanwhile, Rionya, Fire Dancer continuously replenishes those sacrifices by churning out token copies of Avenger of Zendikar at the start of each combat. By repeating this loop every extra turn, you generate an endless parade of Plant tokens to continuously pay for Time Sieve, locking down the game through sheer temporal dominance.