Satoru Umezawa and Mist-Syndicate Naga on the battlefield.
Mist-Syndicate Naga does not have summoning sickness and cannot be blocked by an opponent.
You control up to seven lands that can tap to produce at least ({4} magic symbol) ({U} magic symbol) ({U} magic symbol) ({B} magic symbol) .
Steps
Declare Mist-Syndicate Naga as an attacker.
When it isn't blocked, activate up to seven lands you control by tapping them, adding at least ({4} magic symbol) ({U} magic symbol) ({U} magic symbol) ({B} magic symbol) .
Activate Palinchron's ninjutsu ability by paying ({2} magic symbol) ({U} magic symbol) ({B} magic symbol) and returning Mist-Syndicate Naga from the battlefield to your hand, putting Palinchron onto the battlefield from your hand tapped and attacking.
When Palinchron enters the battlefield, it triggers, untapping up to seven lands.
Activate Mist-Syndicate Naga's ninjutsu ability by paying ({2} magic symbol) ({U} magic symbol) and returning Palinchron from the battlefield to your hand, putting Mist-Syndicate Naga onto the battlefield from your hand tapped and attacking.
Repeat from step 2.
If you control up to seven lands that can tap to produce at least ({5} magic symbol) ({U} magic symbol) ({U} magic symbol) ({B} magic symbol) , this combo nets infinite mana.