Eternal Witness, Snap, and Gaea's Cradle

Prerequisites

• Eternal Witness on the battlefield
• Snap in hand
• Gaea's Cradle on the battlefield
• available

Steps

1. Activate Gaea's Cradle by tapping it, adding at least
2. Activate another land by tapping it, adding at least
3. Cast Snap by paying , returning Eternal Witness from the battlefield to your hand and untapping Gaea's Cradle and the land tapped in step 2
4. Cast Eternal Witness by paying
5. When Eternal Witness enters, it triggers, returning Snap from your graveyard to your hand
6. Repeat

Results

• Infinite creature ETB
• Infinite creature LTB
• Infinite green mana
• Infinite magecraft triggers
• Infinite mana lands you control can produce
• Infinite storm count
• Infinite untap of lands you control