Satoru Umezawa + Silver-Fur Master + Great Whale

Prerequisites

• You control another nontoken creature that can attack this turn, and that cannot be blocked by an opponent.
• You control up to seven lands that can tap to produce at least .

Steps

1. 1Declare another nontoken creature as an attacker.
2. 2When the creature isn't blocked by an opponent, activate up to seven lands you control by tapping them, adding at least .
3. 3Activate Great Whale's ninjitsu ability by paying and returning the unblocked creature to your hand, putting Great Whale onto the battlefield tapped and attacking.
4. 4Great Whale enters the battlefield, untapping the seven lands.
5. 5Activate any creature card in your hand's ninjitsu ability by paying and returning Great Whale to your hand, putting the creature onto the battlefield tapped and attacking.
6. 6Activate up to seven lands you control by tapping them, adding at least .
7. 7Repeat from step 3.

Effects

• Infinite ETB
• Infinite LTB
• Infinite mana lands you control can produce
• Infinite untap of lands you control