I think the Mech was a good choice for this - the high health and shields held up well against your opponent's mixed attack, but the real starts are the sneak/ vulture/ brownie boost combo who neutralised his Snipe.
Death is very weak against sneak especially, I often struggle to find something decent to put at the back to defend against Sneak.
It's also weak against opportunity with so many low health cards.
All in a decent line up/ selection for the rule set!