Chiming in here...
Counter-rush Rush
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Lacking the Grey Nymph substitute another Ivory Dragon. Technically this isn't "fully upped" since the Nymph is unupgraded. But yeah - I think that technicality does not matter here.
A couple bucklers and that Nymph slow down the attack a bit (slower to deploy for the Nymph and 'does not attack' for the buckler) but allows you a chance to beat a faster rush or to win games where you draw slower than average. This is due to most rushes (this one too!) relying on low HP creatures for the attack which have much higher chances to die against the Skull Buckler.
RUSH
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More cheap creatures, no shields and fewer heavy hitting expensive creatures which allows a slight quanta reduction too. FAST but watch out for shields or quick mass CC (as with most Death rushing decks).