I think that the system proposed by Hicks is too expensive because it is impossible for a creature to cost less than 23 complexity under it.
It is expensive, but in some cases... one *IS* creating a whole new creature.
Then again, I'm now reviewing the Zombie Animation ritual on YS 301:
"Zombie Animation
Animating a zombie is a two-spell process: a summoning and a binding. First, the caster must summon a spirit to inhabit the corpse he wishes to animate, and then the caster must bind the spirit to his will.
Type: Thaumaturgy, summoning then binding
Complexity: Varies for both;
the summoning is typically 6-10 (based on conflict against the spirit’s Conviction),
and
the binding is even higher, often 10-14 (again, based on conflict against the spirit’s Conviction and desired duration)
Duration: The summoning is only for a scene, but the binding is of variable duration.
Effect: One spirit is summoned and bound to one corpse, animating it and binding it to the caster’s will.
Variations: Call up additional shifts of power to animate more zombies.
Notes: The caster must provide an audible “heartbeat” for the duration of the binding, most frequently a drumbeat."
So that can range from 16-24 total shifts (split between two rituals, though), for just the one Zombie. I'm not sure how to figure a Spirit's Conviction though...