Umbral Mantle, and The Notary Hobbits

Prerequisites

• Umbral Mantle on the battlefield
• The Notary Hobbits on the battlefield

Steps

1. Activate The Notary Hobbits by tapping it, adding at least Activate The Notary Hobbits by paying and untapping it, giving it +2/+2 until end of turn
2. Repeat

Results

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