It is not strange
If Satan’s ministers
Also disguise themselves
οὐ μέγα οὖν εἰ καὶ οἱ διάκονοι αὐτοῦ μετασχηματίζονται ὡς διάκονοι δικαιοσύνης· ὧν τὸ τέλος ἔσται κατὰ ιοσύνη ἔργα αὐτῶν.
Paul said that it is not strange (οὐ μέγα οὖν) if Satan’s ministers (εἰ καὶ οἱ διάκονοι αὐτοῦ) also disguised (μετασχηματίζονται) themselves as ministers of righteousness (διάκονοι δικαιοσύνης). Their end will (ὧν τὸ τέλος ἔσται) match their deeds (κατὰ ἔγρ ἔργα αὐτῶν). Only the Pauline letters used this word μετασχηματίζονται, that means to change in fashion or outward appearance. Paul explained that it would not be strange to see Satan’s ministers disguise themselves as ministers of righteousness. However, he warned that it would all come out in the wash. Their ending would match their deeds. They would suffer eternal damnation for their current wickedness. Paul insinuated that these false Christian apostles were really ministers of the devil. Do you know anyone that you think is a minister of the devil?