Slobad, Iron Goblin, Yomiji, Who Bars the Way, and Mirran Spy

Prerequisites

• Slobad, Iron Goblin on the battlefield
• Yomiji, Who Bars the Way on the battlefield
• Mirran Spy on the battlefield
• Slobad does not have summoning sickness
• You control a nontoken legendary artifact that can be cast using only red mana

Steps

1. Activate Slobad by tapping it and sacrificing a nontoken legendary artifact, adding an amount of equal to the artifact's mana value that can only be spent to activate abilities of artifacts or cast artifacts spells
2. The artifact leaves the battlefield, triggering Yomiji, returning the artifact from your graveyard to your hand
3. Cast the artifact by paying its mana cost
4. Mirran Spy triggers, untapping Slobad
5. Repeat

Results

• Infinite storm count