Mirran Spy + Cloudstone Curio + Ornithopter + Krenko, Mob Boss

Mirran Spy

Cloudstone Curio

Ornithopter

Krenko, Mob Boss

How it works

1. Activate Krenko by tapping it, creating at least one 1/1 Goblin creature token.
2. When the Goblin(s) enter the battlefield, Cloudstone Curio triggers that many times.
3. Resolve the first trigger, returning Ornithopter to your hand from the battlefield.
4. Resolve all remaining triggers, choosing to return nothing to your hand.
5. Cast Ornithopter by paying 0.
6. Mirran Spy triggers, untapping Krenko.
7. Repeat.

This delightful loop harnesses the synergy between Krenko, Mob Boss and Cloudstone Curio to flood the board with Goblins, using Ornithopter as the revolving door that keeps the engine running for zero mana. Every time you recast your free artifact flyer, Mirran Spy springs into action to untap Krenko, allowing you to tap the Goblin maestro over and over again to grow your unstoppable horde. Cloudstone Curio relies on those newly minted Goblins entering the battlefield to bounce Ornithopter right back to your hand, perfectly resetting the costless chain and letting you repeat the whole spectacle indefinitely.