Zask, Skittering Swarmlord + Verdant Succession + Yahenni, Undying Partisan

Zask, Skittering Swarmlord

Verdant Succession

Yahenni, Undying Partisan

How it works

1. Activate Yahenni by sacrificing another nontoken green Insect.
2. When the Insect dies, Zask and Verdant Succession trigger.
3. Resolve the Zask trigger, putting the Insect on the bottom of your library from your graveyard and causing you to mill two cards.
4. Resolve the Verdant Succession trigger, searching your library for that Insect and putting it onto the battlefield.
5. Resolve the Yahenni ability.
6. Repeat.

This recursive loop is anchored by Yahenni, Undying Partisan, whose sacrifice ability lets you continuously feed a green nontoken Insect into the graveyard to gain indestructible. Each time that creature dies, Verdant Succession triggers to instantly fetch a fresh copy of the exact same insect straight from your library onto the battlefield. Simultaneously, Zask, Skittering Swarmlord catches the dying insect to mill two cards and send it to the bottom of your library, ensuring your deck never runs out of targets for Verdant Succession to find.