Grinning Ignus + Twinning Glass + Merrow Reejerey + Arcane Adaptation

Grinning Ignus

Twinning Glass

Merrow Reejerey

Arcane Adaptation

How it works

1. Cast Grinning Ignus by paying 2.
2. Merrow Reejerey triggers, untapping Twinning Glass.
3. Activate Grinning Ignus by paying and returning it to your hand from the battlefield, adding CC.
4. Activate Twinning Glass by paying 1 and tapping it, causing you to cast Grinning Ignus without paying its mana cost.
5. Repeat from step 2.

Arcane Adaptation sets the stage by transforming every creature you control and cast into a Merfolk, allowing Grinning Ignus to seamlessly trigger Merrow Reejerey every time it enters the battlefield. As that Merfolk trigger untaps Twinning Glass, you can continually bounce Grinning Ignus back to your hand for mana and immediately recast it for free using Twinning Glass's activated ability. This cozy self-sustaining loop spins out of control, generating boundless colorless mana alongside an endless parade of creature entering and leaving the battlefield.