Benthicore, Elemental Mastery, and Maskwood Nexus

Prerequisites

• Benthicore on the battlefield
• Elemental Mastery on the battlefield
• Maskwood Nexus on the battlefield

Steps

1. Activate Benthicore by tapping it, creating five 1/1 Elemental tokens with haste that have all creature types due to Maskwood Nexus
2. Activate Benthicore by tapping two Elemental tokens, untapping Benthicore
3. Repeat

Results

• Infinite creature tokens with haste
• Infinite ETB