Wakeroot Elemental, Castle Garenbrig, and Mana Reflection

Prerequisites

• Wakeroot Elemental on the battlefield
• Castle Garenbrig on the battlefield
• Mana Reflection on the battlefield
• available

Steps

1. Activate Castle Garenbrig's second ability by paying and tapping it, adding twelve that can only be spent to cast creature spells or to activate abilities of creatures
2. Activate Wakeroot Elemental by paying , untapping Castle Garenbrig and causing it to become a 5/5 Elemental creature with haste that's still a land
3. Repeat

Results

• Infinite mana lands you control can produce
• Infinite untap of lands you control
• Infinite green mana that can only be spent to activate abilities of creatures
• Infinite green mana that can only be spent to cast creature spells