Grinning Ignus + Twinning Glass + Merrow Reejerey + Conspiracy

Grinning Ignus

Twinning Glass

Merrow Reejerey

Conspiracy

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.

This intricate loop transforms Grinning Ignus into a self-sustaining engine by completely bypassing its mana cost through Twinning Glass. Because Conspiracy redefines all your creatures and creature spells as Merfolk, every time you recast the Ignus, Merrow Reejerey triggers to untap the Twinning Glass and keep the chain going. Each iteration of this cycle yields a net profit of colorless mana thanks to the excess generated by the Ignus itself.