Satoru Umezawa, Palinchron, and Peregrine Drake

Prerequisites

• Satoru Umezawa on the battlefield
• Palinchron in hand
• Peregrine Drake on the battlefield
• Peregrine Drake does not have summoning sickness and cannot be blocked and killed by an opponent
• You control up to five lands that can tap to produce at least

Steps

1. Declare Peregrine Drake as an attacker
2. When Peregrine Drake is unblocked, activate up to five lands you control by tapping them, adding at least
3. Activate Palinchron's ninjitsu ability by paying and returning Peregrine Drake from the battlefield to your hand, putting Palinchron from your hand onto the battlefield tapped and attacking
4. Palinchron enters the battlefield, untapping up to seven lands
5. Activate up to five lands you control by tapping them, adding at least
6. Activate Peregrine Drake's ninjitsu ability by paying and returning Palinchron from the battlefield to your hand, putting Peregrine Drake from your hand onto the battlefield tapped and attacking
7. Peregrine Drake enters the battlefield, untapping up to five lands
8. Repeat from step 2

Results

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