Satoru Umezawa and Silver-Fur Master on the battlefield.
Silver-Fur Master does not have summoning sickness and cannot be blocked by an opponent.
You control up to five lands that can tap to produce at least ({1} magic symbol) ({U} magic symbol) ({U} magic symbol) ({B} magic symbol) ({B} magic symbol) .
Steps
Declare Silver-Fur Master as an attacker.
When it isn't blocked, activate up to five lands you control by tapping them, adding at least ({1} magic symbol) ({U} magic symbol) ({U} magic symbol) ({B} magic symbol) ({B} magic symbol) .
Activate Peregrine Drake's ninjutsu ability by paying ({1} magic symbol) ({U} magic symbol) ({B} magic symbol) and returning Silver-Fur Master from the battlefield to your hand, putting Peregrine Drake onto the battlefield from your hand tapped and attacking.
When Peregrine Drake enters the battlefield, it triggers, untapping up to five lands.
Activate Silver-Fur Master's ninjutsu ability by paying ({U} magic symbol) ({B} magic symbol) and returning Peregrine Drake from the battlefield to your hand, putting Silver-Fur Master onto the battlefield from your hand tapped and attacking.
Repeat from step 2.
If you control up to five lands that can tap to produce at least ({2} magic symbol) ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) ({B} magic symbol) , this combo nets infinite mana.