Elemental Mastery, Brimstone Trebuchet, and Xenograft

Prerequisites

• Elemental Mastery on the battlefield
• Brimstone Trebuchet on the battlefield
• Xenograft on the battlefield
• undefined

Steps

1. Activate Brimstone Trebuchet by tapping it, creating a 1/1 Elemental creature token
2. The Elemental enters the battlefield as a Knight due to Xenograft, triggering Brimstone Trebuchet, untapping Brimstone Trebuchet
3. Repeat

Results

• Infinite creature tokens with haste
• Infinite ETB