Yenna, Redtooth Regent + Ordeal of Nylea + Amulet of Vigor + Phantatog

Yenna, Redtooth Regent

Ordeal of Nylea

Amulet of Vigor

Phantatog

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 Phantatog's first ability 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, Amulet of Vigor triggers twice, untapping them.
5. Resolve the Phantatog ability from step 2, giving it +1/+1 until end of turn.
6. Activate the two lands by tapping them, adding 2.
7. Repeat.

This intricate engine feeds on Yenna, Redtooth Regent's ability to repeatedly duplicate an enchantment, choosing Ordeal of Nylea as the target to continuously trigger its sacrifice clause. By using Phantatog as a reliable outlet to instantly sacrifice the newly created token copy, you bypass the usual combat requirement and immediately trigger the Ordeal's search effect. Amulet of Vigor plays a vital role behind the scenes, ensuring that the fetched basic lands enter the battlefield tapped and immediately untap so you can generate the exact amount of mana needed to fuel Yenna's next activation.