Quickbeam, Upstart Ent + Devoted Druid + Thopter Squadron + Arcane Adaptation

Quickbeam, Upstart Ent

Devoted Druid

Thopter Squadron

Arcane Adaptation

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 Arcane Adaptation, 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.