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Dralnus Crusade answers a lot of the relevant big threats for goblins after sideboard, mainly Circle of Protection: Red, Engineered Plague and Sphere of Law

A reliable source of extra lands is Realmbreaker, the Invasion Tree, which allows you to mill three cards from an opponent's deck and then put a land from their graveyard into play

Decks without redundancy are far more vulnerable to the Arcane Denial as far fewer cards will be important at any given time

Players would not only have to collect every card from a single set which wouldnt be cheap, they would then have to buy packs after dusting

However, most effects that do this also allow you to cast the copy, and casting the copy will cause magecraft abilities to trigger.