RPGMemes

Wish is an easy one, since it can be used to cast most of the other spells talked about here

Clone, immortality without any of the normal downsides (I can choose to die still and don't need souls or any bs like that)

Identify and go pawn shop hunting and the like

Really most divination spells would be solid for stock market manipulation

Enchantment spells for manipulating the corporate ladder, or getting into politics or something (mass suggestion in the really any political nexus, geus for more targeted things, modify memory, etc).

Healing and revivification spells and sell my services to the elite, bring back the dead, speak to loved ones, etc. Clone works well here too, especially since it has age manipulation.