All permanents on the battlefield (Sakashima of a Thousand Faces as a copy of Havi).
Steps
Activate Blasting Station by tapping it and sacrificing Sakashima of a Thousand Faces.
When Sakashima of a Thousand Faces dies, it and Havi trigger.
Resolve the Havi trigger, returning Sakashima of a Thousand Faces from your graveyard to the battlefield as a copy of Havi.
When Sakashima of a Thousand Faces enters the battlefield, Blasting Station triggers, untapping Blasting Station.
Resolve the Sakashima of a Thousand Faces trigger, returning any legendary creature card with mana value 5 or less from your graveyard to the battlefield.
Resolve the Blasting Station ability from step 1, dealing 1 damage to any target.
Repeat.
Results
Infinite LTB.
Infinite ETB.
Infinite sacrifice triggers.
Infinite death triggers.
Infinite damage.
Put all legendary creature cards with mana value 5 or less from your graveyard onto the battlefield.