Sage of Hours + Donatello, the Brains + Bootleggers' Stash

Sage of Hours

Donatello, the Brains

Bootleggers' Stash

How it works

1. Activate five lands by tapping them, creating five Treasure tokens and five Mutagen tokens due to Donatello.
2. Activate the five Treasures by tapping and sacrificing them, adding 5.
3. Activate the five Mutagens by paying 5, tapping and sacrificing them, putting five +1/+1 counters on Sage of Hours.
4. Activate Sage of Hours by removing all +1/+1 counters from it, causing you to take at least one extra turn after this one.
5. Repeat each turn.

This clever setup relies on turning your ordinary mana-producing lands into token factories using Bootleggers' Stash, which then interact with Donatello, the Brains to double your token generation by tossing in extra Mutagen tokens for free. Once you've gathered five of those Mutagens, you can cash them in for the exact five mana needed to activate their ability, pumping Sage of Hours full of the five +1/+1 counters required for its activation. Finally, you cash in those counters with Sage of Hours to take an extra turn, untapping everything and letting you repeat the entire process to lock down infinite turns.