Hmmmmm well you've done two things! Impress me and also further my opinion that the Gandalf hero is far too powerful
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Your use of Eagles of the Misty Mountains is pretty clever (no attachments to remove, more than one health and after sacrificing several other eagles they can actually block most damage from Durin's Bane altogether, especially buffed with Arwen). Thorondor is also a good pick!
So good work on your strategy and win! It does look like Gandalf was quite largely responsible however as without him you wouldn't have been able to play allies so fast. I also still don't think a nightmare deck like that should be so easily beatable.
Don't the fallen eagles that buff Eagles of the Misty Mountains count as attachments? I'm pretty sure Blazing Grip would take them out (although at least not undefended).