Cloudstone Curio + Hornet Queen + Mana Echoes + Energy Refractor

Cloudstone Curio

Hornet Queen

Mana Echoes

Energy Refractor

How it works

1. Cast Hornet Queen by paying 4.
2. When Hornet Queen enters the battlefield, it, Cloudstone Curio, and Mana Echoes trigger.
3. Resolve the Cloudstone Curio trigger, returning nothing to your hand from the battlefield.
4. Resolve the Hornet Queen trigger, creating four 1/1 Insect creature tokens.
5. When the Insects enter the battlefield, Mana Echoes and Cloudstone Curio each trigger four times.
6. Resolve the first Cloudstone Curio trigger, returning Hornet Queen from the battlefield to your hand.
7. Resolve all remaining Cloudstone Curio triggers, returning nothing to your hand from the battlefield.
8. Resolve all Mana Echoes triggers, adding 5 for each Insect you control.
9. Activate Energy Refractor three times by paying 6, adding .
10. Repeat.

This loop is a masterclass in recursive value, turning the arrival of Hornet Queen into an endless swarm of deathtouch flyers. As each wave of Insect tokens hits the battlefield, Mana Echoes floods your mana pool with a bounty of colorless energy scaled to your growing army. Cloudstone Curio watches the chaos unfold, using the shared creature types to effortlessly bounce Hornet Queen back to your hand so you can cast it all over again. Finally, Energy Refractor steps in as the ultimate mechanical translator, converting that mountain of colorless mana into the exact colored mana you need to sustain the entire cycle indefinitely.