These mighty Gods - האדרים האלהים מיד miyad haelohim haaddirim, from the hand of these illustrious Gods. Probably this should be translated in the singular, and not in the plural: Who shall deliver us from the hand of this illustrious God?
This is a remarkable testimony on the part of the Philistines to the truth of the events which are recorded in the Pentateuch. The Philistines would of course hear of them, just as Balak and the people of Jericho did Numbers 22:5; Joshua 2:10.
With all the plagues - Rather, “with every kind of plague” equivalent to “with utter destruction.