Sliver Queen + Quickbeam, Upstart Ent + Devoted Druid + Xenograft

Sliver Queen

Quickbeam, Upstart Ent

Devoted Druid

Xenograft

How it works

1. Activate Devoted Druid's first ability by tapping it, adding .
2. Activate Devoted Druid's second ability by putting a -1/-1 counter on it, untapping it.
3. Activate Devoted Druid's first ability by tapping it, adding .
4. Activate Sliver Queen by paying 1, creating a 1/1 Sliver creature token.
5. When the Sliver enters the battlefield as a Treefolk due to Xenograft, Quickbeam triggers, giving Devoted Druid and up to one other creature +2/+2 until end of turn.
6. Activate Devoted Druid's second ability by putting a -1/-1 counter on it, untapping it.
7. Repeat.

This clever loop harnesses Xenograft to turn every creature you control—including the tokens churned out by Sliver Queen—into Treefolk whenever they enter the battlefield. That shared creature type means that every new Sliver arrival lets Quickbeam, Upstart Ent trigger its buff, continuously pumping up your army's power and trample. Meanwhile, Devoted Druid provides the engine's renewable green mana and untap mechanics, effortlessly paying for the Queen's token creation while surviving the stat-boosting chaos around it.