Rukarumel, Biologist + Lurking Roper + Cryptolith Rite + Judge of Currents

Rukarumel, Biologist

Lurking Roper

Cryptolith Rite

Judge of Currents

How it works

1. Activate Lurking Roper by tapping it, adding one mana of any color.
2. Judge of Currents triggers, causing you to gain 1 life.
3. Lurking Roper triggers, untapping itself.
4. Repeat.

This clever loop turns ordinary life-gain into a self-sustaining mana engine by completely rewriting creature types and abilities across the board. Rukarumel, Biologist acts as the ultimate architect here, turning Lurking Roper and Judge of Currents into Merfolk and Slivers in addition to their other types so they can communicate seamlessly. With Cryptolith Rite granting every creature the ability to tap for any color of mana, tapping Lurking Roper for mana immediately fires off Judge of Currents's life-gain trigger. That tiny blip of life then triggers Lurking Roper's own static untap ability, allowing you to untap and repeat the entire cycle for infinite colored mana and infinite life.