Nee, dat hoeft niet. De token komt pas na de declare attackers step op tafel, waardoor hier geen extra mana voor betaald hoeft te worden.

8/23/2019
Any effects that say that the token can't attack (such as that of Doomed Artisan, or if you copy a token with defender) affect only the declaration of attackers. They won't stop the token you populate from entering the battlefield attacking.