Sliver Queen + Quickbeam, Upstart Ent + Devoted Druid + Arcane Adaptation

Sliver Queen

Quickbeam, Upstart Ent

Devoted Druid

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 Sliver Queen by paying 1, creating a 1/1 Sliver creature token.
5. When the Sliver 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 Devoted Druid's second ability by putting a -1/-1 counter on it, untapping it.
7. Repeat.