Yenna, Redtooth Regent + Ordeal of Nylea + Tiller Engine + Gatherer of Graces

Yenna, Redtooth Regent

Ordeal of Nylea

Tiller Engine

Gatherer of Graces

How it works

1. Activate Yenna by paying 2 and tapping it, creating a token copy of Ordeal of Nylea, then untapping Yenna and causing you to scry 2.
2. Activate Gatherer of Graces by sacrificing the Ordeal of Nylea token.
3. The Ordeal of Nylea token's second ability triggers, causing you to search your library for two basic land cards and put them onto the battlefield tapped.
4. When the lands enter the battlefield, Tiller Engine triggers twice, untapping them.
5. Resolve the Gatherer of Graces ability from step 2, regenerating it.
6. Activate the two lands by tapping them, adding 2.
7. Repeat.

This clever loop turns Yenna, Redtooth Regent into an endless engine by using its ability to duplicate Ordeal of Nylea, taking advantage of the fact that the token copy isn't legendary. When you sacrifice that copy to Gatherer of Graces, the Ordeal's sacrifice ability triggers to fetch two basic lands straight from your library onto the battlefield. Those lands enter tapped, which is where Tiller Engine comes in—its static ability immediately triggers to untap them so you can tap them again for the mana needed to restart the cycle. Meanwhile, Gatherer of Graces sits ready to safely consume each new Aura copy to keep the loop going while protecting itself through regeneration.