Sliver Queen + Rukarumel, Biologist + Quickbeam, Upstart Ent + Devoted Druid

Sliver Queen

Rukarumel, Biologist

Quickbeam, Upstart Ent

Devoted Druid

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 Rukarumel, 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.

This elegant sequence transforms Devoted Druid into an infinite mana engine by repeatedly tapping for green and untapping itself at the cost of -1/-1 counters, though those counters are safely absorbed by its massive temporary toughness boosts. The engine is fueled by Sliver Queen, whose ability is discounted to just {1}{G} thanks to the mana generated, creating an endless parade of tokens. The true brilliance lies in Rukarumel, Biologist, whose static ability rewrites reality so that every single creature token entering the battlefield also counts as a Treefolk. That effortless classification instantly trips Quickbeam, Upstart Ent's triggered ability, flooding your team with infinitely scaling power and trample until the turn ends.