Marvin, Murderous Mimic + Kami of Whispered Hopes + Soliton

Marvin, Murderous Mimic

Kami of Whispered Hopes

Soliton

How it works

1. Activate Marvin using Kami of Whispered Hopes's ability by tapping it, adding at least .
2. Activate Marvin using Soliton's ability by paying , untapping it.
3. Repeat.

This elegant mana engine hinges on Marvin, Murderous Mimic absorbing the right toolkit to go infinite. By copying Kami of Whispered Hopes, Marvin gains a powerful tap ability that scales with its own power, which is naturally supercharged by Kami's replacement effect whenever +1/+1 counters land on it. At the same time, absorbing Soliton gives Marvin the crucial untap engine it needs to keep going. You simply tap Marvin to generate excess mana, spend a fraction of it to untap via Soliton's ability, and repeat the loop as many times as you desire for boundless colored mana.