Quickbeam, Upstart Ent + Devoted Druid + Spawnsire of Ulamog + Xenograft

Quickbeam, Upstart Ent

Devoted Druid

Spawnsire of Ulamog

Xenograft

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 Xenograft, 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 ingenious engine uses Xenograft to rewrite every creature you control into a Treefolk, which bridges the gap between your token generators and your buffs. With that enchantment in play, every batch of tokens created by Spawnsire of Ulamog causes Quickbeam, Upstart Ent to trigger twice, pumping Devoted Druid with massive stat boosts that easily absorb the physical toll of its self-untapping ability. By repeatedly tapping and untapping Devoted Druid using its own -1/-1 counter ability, you generate infinite green mana to endlessly pay for Spawnsire of Ulamog's token-making ability, looping the entire process to flood the board with infinite Eldrazi Spawn and towering, trample-bearing attackers.