The statement that accurately describes the type of government based on the characteristics provided in the chart is:
"The Thirty was an oligarchy, the ecclesia was a democracy, and the Mycenaean Palace was a monarchy."
This aligns with historical definitions where the Thirty refers to the Thirty Tyrants in Athens, which was an oligarchic regime, the ecclesia is the assembly of Athenian citizens which operated as a democratic governing body, and Mycenaean palaces were typically associated with monarchical rule.