Biomancer's Familiar, Umbral Mantle, and Arixmethes, Slumbering Isle

Prerequisites

• Biomancer's Familiar on the battlefield
• Umbral Mantle on the battlefield
• Arixmethes, Slumbering Isle on the battlefield

Steps

1. Activate Arixmethes by tapping it, adding
2. Activate Arixmethes by paying and untapping it, giving it +2/+2 until end of turn
3. Repeat

Results

• Infinite colored mana
• Infinitely large Arixmethes until end of turn
• Infinite untap of creatures you control
• Infinite mana creatures you control can produce
• Infinitely large creature until end of turn