Metastatic Evangel + Cloudstone Curio + Basking Broodscale

Metastatic Evangel

Cloudstone Curio

Basking Broodscale

How it works

1. Cast the creature by paying 0.
2. When the creature enters the battlefield, Metastatic Evangel triggers, and Cloudstone Curio triggers if the creature was not an artifact.
3. Resolve the Cloudstone Curio trigger, if applicable, choosing to return nothing to your hand.
4. Resolve the Metastatic Evangel trigger, causing you to put a +1/+1 counter on Basking Broodscale.
5. Basking Broodscale triggers, creating a 0/1 Eldrazi Spawn creature token.
6. When the Eldrazi Spawn enters the battlefield, Cloudstone Curio triggers, returning the creature with mana cost 0 from the battlefield to your hand.
7. Repeat.

This clever loop turns a simple zero-mana creature into an infinite engine by relying on the interplay of persistent triggers and shared permanent types. Basking Broodscale serves as the centerpiece, generating both an Eldrazi Spawn token and a +1/+1 counter whenever counters are placed on it, which simultaneously fuels Cloudstone Curio's bounce trigger and triggers Metastatic Evangel to proliferate. By using the Eldrazi Spawn token's entry to bounce your zero-cost creature back to hand via Cloudstone Curio, you can recast it endlessly to repeat the sequence. Metastatic Evangel ensures that every single iteration automatically bumps your counters higher, allowing you to scale this loop infinitely across your board.