Thousand-Faced Shadow, Great Whale, and Prosperous Thief

Prerequisites

• Thousand-Faced Shadow in hand
• Great Whale on the battlefield
• Prosperous Thief on the battlefield
• Prosperous Thief and Great Whale do not have summoning sickness
• An opponent cannot block Prosperous Thief or Great Whale
• You control up to seven lands that can tap to produce at least

Steps

1. Declare Great Whale and Prosperous Thief as attackers
2. When they aren't blocked, activate up to seven lands you control by tapping them, adding at least
3. Activate Thousand-Faced Shadow's ninjutsu ability by paying and returning Prosperous Thief from the battlefield to your hand, putting Thousand-Faced Shadow onto the battlefield from your hand tapped and attacking
4. When Thousand-Faced Shadow enters the battlefield, it triggers, creating a token copy of Great Whale that is tapped and attacking
5. When the Great Whale token enters the battlefield, it triggers, untapping up to seven lands
6. Activate Prosperous Thief's ninjutsu ability by paying and returning Thousand-Faced Shadow from the battlefield to your hand, putting Prosperous Thief onto the battlefield from your hand tapped and attacking
7. Repeat from step 2
8. Deal combat damage using the Great Whale tokens, dealing infinite combat damage to the defending opponent
9. If you control up to seven lands that can tap to produce at least , this combo nets infinite mana

Results

• Infinite combat damage to target opponent
• Infinite creature tokens
• Infinite ETB
• Infinite LTB
• Infinite mana lands you control can produce
• Infinite untap of lands you control