Quickbeam, Upstart Ent + Devoted Druid + Spawnsire of Ulamog + Arcane Adaptation

Quickbeam, Upstart Ent

Devoted Druid

Spawnsire of Ulamog

Arcane Adaptation

How it works

1. Activate Spawnsire of Ulamog's first ability by paying 4, creating two 0/1 Eldrazi Spawn creature tokens.
2. When the Eldrazi Spawns enter the battlefield as Treefolk due to Arcane Adaptation, Quickbeam triggers twice, giving Devoted Druid and up to one other creature +4/+4 until end of turn.
3. Activate Devoted Druid's first ability by tapping it, adding .
4. Activate Devoted Druid's second ability by putting a -1/-1 counter on it, untapping it.
5. Repeat from step 3 three additional times.
6. Repeat from step 1.

This looping masterpiece transforms a simple mana dork and a massive Eldrazi into an infinite engine by rewriting creature types with Arcane Adaptation. Because every creature you control—including the Eldrazi Spawn tokens created by Spawnsire of Ulamog—is legally a Treefolk, their entry triggers Quickbeam, Upstart Ent to pump your board. Meanwhile, Devoted Druid fuels the mana needed to keep churning out new tokens from Spawnsire of Ulamog by repeatedly tapping and untapping itself with its own -1/-1 counter ability.