Prerequisites
- Elemental Mastery on the battlefield
- Brimstone Trebuchet on the battlefield
- Xenograft on the battlefield
- Elemental Mastery attached to Brimstone Trebuchet
- Brimstone Trebuchet does not have summoning sickness
- "Knight" chosen with Xenograft
Steps
- Activate Brimstone Trebuchet by tapping it, creating a 1/1 Elemental creature token
- The Elemental enters the battlefield as a Knight due to Xenograft, triggering Brimstone Trebuchet, untapping Brimstone Trebuchet
- Repeat
Results
Required Cards 3
Elemental Mastery
Enchantment — Aura
Brimstone Trebuchet
Artifact Creature — Wall