Is it permissible to recite "Maliki yawm al-din" (Master of the Day of Judgment) in Al-Fatiha and then complete the other surah with the recitation of Hafs?

It is permissible to begin reciting Al-Fatihah with the words "Maliki Yawm al-Din" according to the recitation of Nafi' and those who agreed with him, and then to complete it with the narration of Hafs or other authentic narrations. Your prayer is valid, and there is no disagreement on this matter. Ibn al-Arabi said: "If the recitation is established and the letters are bound, then no one is obliged to recite with the recitation of only one person… Rather, it is permissible for him to recite Al-Fatihah and recite its letters according to three different recitations because all of it is Qur'an."