Arcane Capitalist

A young arcanist who was captured unexpectedly received a malicious gift from a remnant soul from another world. One day, the young arcanist looked at the sky alone and thought: If he communicates with the core of the planet under his feet and directly extracts mana, then this seems to mean that as long as there is an arcane tower that stores mana, he has unlimited mana? In this world where mana is equivalent to currency, does it mean having unlimited wealth? How to spend such a big sum of money? Opening a bank seemed like a good idea. But I still can't spend all my money, so I might as well be the mastermind behind the scenes and invest in the gifted child of destiny! But the Arcane Tower is expensive, which is a hassle.