I, the Lord, have DECEIVED that prophet

[tonychanyt]

What kind of God was that?

The sovereign kind. God does not lie (Ti 1:2).

Let's see the context. Ez 14:

1 Certain of the elders of Israel came to me and sat before me. 2 And the word of the Lord came to me: 3 “Son of man, these men have taken their idols into their hearts, and set the stumbling block of their iniquity before their faces. Should I indeed let myself be consulted by them?

Ezekiel was addressing the idolatrous elders. God was losing patience with them.

7 For any one of the house of Israel, or of the strangers who sojourn in Israel, who separates himself from me, taking his idols into his heart

These people in Israel worshipped idols, not God.

and putting the stumbling block of his iniquity before his face, and yet comes to a prophet to consult me through him, I the Lord will answer him myself.

The Lord would answer these people strictly and harshly.

8 And I will set my face against that man; I will make him a sign and a byword and cut him off from the midst of my people, and you shall know that I am the Lord.

They would know who was the Lord and who was not.

9 And if the prophet is deceived and speaks a word, I, the Lord, have deceived that prophet,

ie, I, the Lord, in my sovereignty, have deceived that prophet.

This prophet spoke false words. The Lord, in his ultimate sovereignty, permitted this to happen because of his idolatrous heart.

and I will stretch out my hand against him and will destroy him from the midst of my people Israel. 10 And they shall bear their punishment—the punishment of the prophet and the punishment of the inquirer shall be alike—

They were responsible for their idolatry.

11 that the house of Israel may no more go astray from me, nor defile themselves anymore with all their transgressions, but that they may be my people and I may be their God, declares the Lord God.”

In the end, it was for a good cause that God allowed these things to happen.

Did God deceive that prophet?

No, not directly. However, in his sovereignty, he permitted that prophet to be deceived because of their own idolatrous heart. They were responsible for their beliefs.