Weaver of Harmony, Umbral Mantle, Carpet of Flowers, and Stormtide Leviathan

Prerequisites

• Weaver of Harmony on the battlefield
• Umbral Mantle on the battlefield
• Carpet of Flowers on the battlefield
• Stormtide Leviathan on the battlefield
• available

Steps

1. At the beginning of your precombat main phase, Carpet of Flowers triggers
2. Holding priority, activate Weaver of Harmony by paying and tapping it, copying Carpet of Flowers's ability
3. Resolve the copy of Carpet of Flowers's ability, targeting an opponent that controls at least five lands, adding at least
4. Activate Weaver of Harmony by paying and untapping it, giving it +2/+2 until end of turn
5. Repeat from step 2

Results

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