Ghired, Mirror of the Wilds, Molten Echoes, and Great Oak Guardian

Prerequisites

• Ghired, Mirror of the Wilds on the battlefield
• Molten Echoes on the battlefield
• Great Oak Guardian in hand
• "Treefolk" chosen with Molten Echoes available

Steps

1. Cast Great Oak Guardian by paying
2. When Great Oak Guardian enters the battlefield, it and Molten Echoes trigger
3. Resolve the Great Oak Guardian trigger, untapping all creatures you control and giving them +2/+2 until end of turn
4. Resolve the Molten Echoes trigger, creating a token copy of Great Oak Guardian with haste
5. When the Great Oak Guardian token enters the battlefield, it triggers, untapping all creatures you control and giving them +2/+2 until end of turn
6. Activate Ghired by tapping it, creating a copy of the Great Oak Guardian token
7. Repeat from step 5

Results

• Infinite creature tokens with haste
• Infinite ETB
• Infinitely large creatures you control until end of turn
• Infinite mana creatures you control can produce
• Infinite untap of creatures you control