Increase your spell damage (+15%). Slightly decrease your staves and alchemy damage (-10%).

Level	Spell damage	Staves/alchemy damage
0	100%	100%
1	115%	90%
2	132%	81%
3	152%	72%
4	175%	65%
5	201%	59%

Tips

Mixing "affinity" perks of multiple types can be considered counter-productive. For example, Alchemy Affinity + Spell affinity will result in 103.5% alchemy damage, 103.5% spell damage, and 81% staff damage. Mixing all 3 types results in 93% for each discipline, meaning that you get lower-than-original damage at a price of 3 levels.

*Are we sure the math works this way? I.e. redetermining after each card based off the new total, or is it just total percentage modification off the original 100% value? It'd change the numbers quite a lot depending.

Example:

First way - Take 100, decrease it by 50% for 50, increase 50 by 50% to get 75.

Second way - Take 100, compute the total percentage change as +50% -50% for a net change of 0 - to get 100.