how large should a champion pool be (Low elo)

I play top lane and was wondering how may champs I should have? I'm asuming 3 incase it gets taken/banned and if so, here's what I'm thinking about 1) Nasus (Highest mastery points champ on my list) 2)Dr. Mundo (Bad engage but amazing tank for low elo) 3) NOT SURE so for number 3 I'm thinking... 1) Illaoi (her ult can be amazing in team fights, not to mention that her ult has a low CD, and she's a great bully) 2) Malphite (amazing engage / perfect for high AD matchups) 3) YOUR SUGGESTIONS!
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