Jenson Carthalion, Druid Exile, Nyxbloom Ancient, and Umbral Mantle

Prerequisites

• Jenson Carthalion, Druid Exile on the battlefield
• Nyxbloom Ancient on the battlefield
• Umbral Mantle on the battlefield
• undefined available

Steps

1. Activate Jenson by paying and tapping it, adding three mana of each color
2. Activate Jenson by paying and untapping it, giving itself +2/+2 until end of turn
3. Repeat

Results

• Infinite colored mana
• Infinitely large Jenson Carthalion until end of turn