Skullsnatcher 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 ({2} magic symbol) ({U} magic symbol) ({B} magic symbol) ({B} magic symbol) .
Steps
Declare
Skullsnatcher as an attacker.
When it isn't blocked, activate up to seven lands you control by tapping them, adding at least ({2} magic symbol) ({U} magic symbol) ({B} magic symbol) ({B} magic symbol) .
Activate
Palinchron's ninjutsu ability by paying ({2} magic symbol) ({U} magic symbol) ({B} magic symbol) and returning
Skullsnatcher 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
Skullsnatcher's ninjutsu ability by paying ({B} magic symbol) and returning
Palinchron from the battlefield to your hand, putting
Skullsnatcher 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 ({3} magic symbol) ({U} magic symbol) ({B} magic symbol) ({B} magic symbol) , this combo nets infinite mana.