Careful Cultivation, Sword of the Paruns, and Biomancer's Familiar

Prerequisites

• Careful Cultivation on the battlefield
• Sword of the Paruns on the battlefield
• Biomancer's Familiar on the battlefield
• Umbral Mantle and Careful Cultivation attached to the same creature you control that does not have summoning sickness

Steps

1. Activate the creature with Careful Cultivation and Sword of the Paruns attached by tapping it, adding
2. Activate Sword of the Paruns by paying , untapping the creature
3. Repeat

Results

• Infinite green mana
• Infinite untap of creatures you control
• Infinite mana creatures you control can produce