Master Banker 10
Store 15,000,000 Mana in your Mana Bank

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Two methods:

1. A way to do it (near constantly for upgrades) is beat Summit on Insane difficulty to acquire your Animus pet. If it has roughly 26+ upgrade levels, upgrade it's projectile speed and ONLY its projectile speed. PS levels faster than any other stat, and will reach the hundreds of thousands...and after you upgrade the pet, will be worth more than 15mil. Then simply sell it.

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2. A Good way to earn mana fast is Mageus Quarters on hard or insane survival. Squire is better for this. Place 1 bowling ball tower on the left and center stairwells up to the crystal, and a bouncer on the right. This should take care of wave one.Next, set up all stairs up to the crystal to have a bouncer in front of 2 bowling towers, you should be able to do this by now, but it may take another round if you are a lower level.

Now place 2 harpoon towers between the left and center stairs on the edge to cover the birds.Place 2 more harpoons on the edge between the center and right stairs. I also like putting a slicer right in front of the crystal to be safe. Upgrade whatever you want, and let it go.