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How much can a MAC-using attacker change the Tag and encrypted data? The recipient can always identify whether the Tag/ciphertext has been updated, hence this attack will fail?

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How much can a MAC-using attacker change the Tag and encrypted data? The recipient can always identify whether the Tag/ciphertext has been updated, hence this attack will fail?

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Similar questions

What happens if an adversary modifies the Tag (MAC) and ciphertext of a communication while it is in transit using a MAC? Explain why a recipient will always detect a modified Tag or ciphertext and why this attack is unsuccessful.
Is it possible for a message authentication code to change the Tag or the ciphertext while it is in transit? Recipients will always be able to detect a tampered Tag/ciphertext, rendering this attack futile.
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