Quickbeam, Upstart Ent + Devoted Druid + Thopter Squadron + Conspiracy

Quickbeam, Upstart Ent

Devoted Druid

Thopter Squadron

Conspiracy

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 Thopter Squadron's first ability by paying 1 and removing a +1/+1 counter from it, creating a 1/1 Thopter artifact creature token.
5. When the Thopter enters the battlefield as a Treefolk due to Conspiracy, Quickbeam triggers, giving Devoted Druid and up to one other creature +2/+2 until end of turn.
6. Activate Thopter Squadron's second ability by paying 1 and sacrificing the Thopter, putting a +1/+1 counter on Thopter Squadron.
7. Activate Devoted Druid's second ability by putting a -1/-1 counter on it, untapping it.
8. Repeat.

This cunning loop relies on Conspiracy to radically rewrite the identity of your entire board, turning every creature you control into a Treefolk. With that type-shifting enchantment in place, every Thopter token spawned by Thopter Squadron—fueled by the infinite green mana generated through Devoted Druid's self-countering untap ability—immediately triggers Quickbeam, Upstart Ent's buff whenever another Treefolk enters. By cycling those tokens back into Thopter Squadron using its sacrifice ability, you perpetually fuel its counter reserves while generating boundless entry, exit, and death triggers to overwhelm your opponents.