Adagia, Windswept Bastion + Treachery + Simic Growth Chamber

Adagia, Windswept Bastion

Treachery

Simic Growth Chamber

How it works

1. Activate Simic Growth Chamber and up to three other lands by tapping them, adding at least 4.
2. Activate Adagia by paying 3 and tapping it, creating a token copy of Treachery that is legendary attached to any creature.
3. If you control two legendary Treachery permanents, put one into your graveyard due to the legend rule.
4. The Treachery token's enter-the-battlefield ability triggers, untapping Adagia, Simic Growth Chamber and up to three other lands.
5. Repeat.

This ingenious loop turns the powerful mana-untapping aura Treachery into a self-replicating engine using the station and copying capabilities of Adagia, Windswept Bastion. By using Simic Growth Chamber alongside your other lands to float the necessary mana, you pay to create a legendary token copy of Treachery that immediately enters the battlefield and triggers its own entry ability. That trigger untaps Adagia, Simic Growth Chamber, and your other lands so you can feed the loop again, while the legend rule conveniently dispatches the redundant copy to the graveyard to clear the way for the next iteration.