The phrase “Great Deceiver” does not occur in the Bible.
There are two references to “the deceiver”:
For many deceivers have gone out into the world, those who do not confess the coming of Jesus Christ in the flesh. Such a one is the deceiver and the antichrist. (2 John 1:7)
And the great dragon was thrown down, that ancient serpent, who is called the devil and Satan, the deceiver of the whole world—he was thrown down to the earth, and his angels were thrown down with him. (Revelation 12:9)
The first verse says “the deceiver” is anyone who does not accept that Jesus is a real human being — possibly referring to the common Trinitarian belief that Jesus preexisted before his birth and is God himself. The Bible clearly teaches that Jesus is human (1 Timothy 2:5) and that God is his literal father (Luke 1:30-35).
The second verse is in the middle of a highly symbolic passage where the dragon (the deceiver) is a symbol of sin fighting against God’s people.
A third passage which refers to someone who leads people astray is 2 Thessalonians 2, describing the “man of lawlessness”. This passage is discussed in the answer to “Who is the great deceiver in the last days?”