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

Mirran Spy

Cloudstone Curio

Memnite

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 Memnite to your hand from the battlefield.
4. Resolve all remaining triggers, choosing to return nothing to your hand.
5. Cast Memnite by paying 0.
6. Mirran Spy triggers, untapping Krenko.
7. Repeat.

This clever loop transforms free artifact casting into an unstoppable Goblin uprising by chaining together triggers from each piece. Krenko, Mob Boss kicks off the sequence by flooding the board with tokens, which in turn causes Cloudstone Curio to trigger and bounce Memnite back to your hand. Because Memnite costs zero mana, you can immediately recast it from your hand; this cast triggers Mirran Spy in the air, instantly untapping Krenko so the whole process can begin anew.