Palinchron and Prosperous Thief on the battlefield.
Prosperous Thief and Palinchron do not have summoning sickness.
An opponent cannot block Prosperous Thief or Palinchron.
You control up to seven lands that can tap to produce at least ({3} magic symbol) ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) .
Steps
Declare Palinchron and Prosperous Thief as attackers.
When they aren't blocked, activate up to seven lands you control by tapping them, adding at least ({3} magic symbol) ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) .
Activate Thousand-Faced Shadow's ninjutsu ability by paying ({2} magic symbol) ({U} magic symbol) ({U} magic symbol) and returning Prosperous Thief from the battlefield to your hand, putting Thousand-Faced Shadow onto the battlefield from your hand tapped and attacking.
When Thousand-Faced Shadow enters the battlefield, it triggers, creating a token copy of Palinchron that is tapped and attacking.
When the Palinchron token enters the battlefield, it triggers, untapping up to seven lands.
Activate Prosperous Thief's ninjutsu ability by paying ({1} magic symbol) ({U} magic symbol) and returning Thousand-Faced Shadow from the battlefield to your hand, putting Prosperous Thief onto the battlefield from your hand tapped and attacking.
Repeat from step 2.
Deal combat damage using the Palinchron tokens, dealing infinite combat damage to the defending opponent.
If you control up to seven lands that can tap to produce at least ({4} magic symbol) ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) , this combo nets infinite mana.