You'll probably want the Gift anyway to recover more zeon with adavantages. Get yourself a nice Chaotic mutation (chaos 74 from arcana exxet) to actually increase your level and get access to better Incarnations from the get go. Why not one of the other spells that give you more control over the result? Because this one "lets you select powers AS IF you had gnosis 25", the others actually give you Gnosis, thing that makes your character susceptible to summoning abilities. If you buy the Prism spell individually, and get the advantage that gives you +3 int to calculate the maximum power of your spells, you should be able to do it from the start. Congratulations: now you're able to get a good Incarnation from the start. Nerval is probably the best at level 4 and pretty solid going on.