"Power is only valuable if it can be harnessed." [Mythos][3.5/PF]

[noob]

I have updated the core how it works is you have to make a focus to cast spells the normal way every other class does. The resource instead of spell slot is the same as you mentioned 153 magicka.

Researching a spell or copying it as a ritual allows you to create the spells focus.

Let us compare to a 5e wizard: 153+120+91 with its three top spell slots.
so a 5e wizard have in his three highest spell slots more magika than most characters of your class(except for those that went very far into optimization)
But maybe comparing this class to the 5e wizard(which is weaker than the 3.5 wizard) is not fair.