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An attack can only be negated during the Battle Step, and if it is negated, the Damage Step does not occur

Therefore a copy of such a creature will acquire the copiable values of the creature as it exists face down - typically a 2/2 colorless, costless, nameless, subtypeless creature - but it will be face up

That said, defer to any specific summoning conditions a card might mention

While it might not be intuitive, Ive found Inquisition of Kozilek to be an excellent card in Modern Jund against decks like Affinity and Burn (the life loss on Thoughtseize can be a large cost and should be evaluated on a case-by-case basis) for exactly this reason

As you can imagine, there are some pretty ridiculously powerful fusion monsters that this can bring out that Konami absolutely does not want you to summon off this card, so they banned it