Thousand-Faced Shadow + Great Whale + Moon-Circuit Hacker

Thousand-Faced Shadow

Great Whale

Moon-Circuit Hacker

How it works

1. Declare Great Whale and Moon-Circuit Hacker as attackers.
2. When they aren't blocked, activate up to seven lands you control by tapping them, adding at least 2.
3. Activate Thousand-Faced Shadow's ninjutsu ability by paying 2 and returning Moon-Circuit Hacker 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 Moon-Circuit Hacker's ninjutsu ability by paying and returning Thousand-Faced Shadow from the battlefield to your hand, putting Moon-Circuit Hacker 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 3, this combo nets infinite mana.

This cunning loop exploits the ninja mechanic to endlessly recycle creatures through your hand, turning a modest mana base into an unstoppable engine. By leveraging Great Whale's enters-the-battlefield trigger to untap your lands, you easily recoup the mana spent on Thousand-Faced Shadow and Moon-Circuit Hacker's ninjutsu costs. Each iteration leaves you further ahead: Thousand-Faced Shadow duplicates the Whale to fuel your lands, while Moon-Circuit Hacker smoothly bounces the Shadow back to hand for just one mana, ultimately generating infinite mana and an overwhelming army of attacking token copies.