Satoru Umezawa + Great Whale + Mukotai Ambusher

Satoru Umezawa

Great Whale

Mukotai Ambusher

How it works

1. Declare Mukotai Ambusher as an attacker.
2. When it isn't blocked, activate up to seven lands you control by tapping them, adding at least 3.
3. Activate Great Whale's ninjutsu ability by paying 2 and returning Mukotai Ambusher from the battlefield to your hand, putting Great Whale onto the battlefield from your hand tapped and attacking.
4. When Great Whale enters the battlefield, it triggers, untapping up to seven lands.
5. Activate Mukotai Ambusher's ninjutsu ability by paying 1 and returning Great Whale from the battlefield to your hand, putting Mukotai Ambusher onto the battlefield from your hand tapped and attacking.
6. Repeat from step 2.
7. If you control up to seven lands that can tap to produce at least 4, this combo nets infinite mana.

This loop hinges on Satoru Umezawa granting every creature card in your hand ninjutsu, turning your entire hand into a revolving door of surprise attackers. By bouncing Mukotai Ambusher to swap in Great Whale, you immediately exploit the Whale's entry trigger to untap your lands and recoup the mana spent. You then use Mukotai Ambusher's cheaper ninjutsu cost to bounce Great Whale back to your hand and restart the cycle, generating infinite mana and endless enter-the-battlefield triggers so long as your lands produce enough juice to fund the swaps.