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

Yenna, Redtooth Regent

Ordeal of Nylea

Amulet of Vigor

Thaumatog

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 Thaumatog's second 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 Thaumatog 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 clever loop turns Yenna, Redtooth Regent into an endless engine by continuously copying Ordeal of Nylea, whose Aura status untaps Yenna upon creation. Once the copy is in play, Thaumatog steps in as a free sacrifice outlet to send the token to the graveyard, instantly triggering the Ordeal's search for two basic land cards. Amulet of Vigor ensures those newly fetched lands immediately enter the battlefield untapped, providing the exact {2} mana needed to pay for Yenna's ability and keep the cycle spinning.