Umbral Mantle, and Kami of Whispered Hopes

Prerequisites

• Umbral Mantle on the battlefield
• Kami of Whispered Hopes on the battlefield
• at most available

Steps

1. Activate Kami of Whispered Hopes by tapping it, adding an amount of mana of any color equal to its power
2. Activate Kami of Whispered Hopes by paying and untapping it, giving it +2/+2 until end of turn
3. Repeat

Results

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