Advice for Wizard spells in tomb of horrors

[Angry Wizard]

I'm about to delve into the tomb of horrors with a large group and I would like some advice on what spells I should be bringing with me. It can be for memorization, scrolls, or wands, I just want to get a broad list to choose from. I'm going to be 9th level with an intelligence of 24, so 5th level spells and below please. Also any gear advice is also appreciated, I've currently bought a Cloak of Resistance +4 and a Headband of Int +4.

[Eltacolibre]

Mount and various summon spells to get disposable creatures. You need to be able to check for traps.

[Angry Wizard]

Eltacolibre wrote:

Mount and various summon spells to get disposable creatures. You need to be able to check for traps.

I've got a wand of unseen servant/mount and I'm putting summoning spells under consideration. Thank you kindly.