Basic beginner questions!?

[Svidler]

Hi,
I haven't played a whole lot but I played it thru at hard atleast.
I still consider myself very newbish after reading some no-casualty
stuff on here and just wanna ask a few prob obv things.
1) When I use sacrifice spell, will these count as casualties in the end? I think so.
2) About the spirits. Is this good prioritizing? sleem: Gloths, Cloud, Shoal, Spit lina: chargers, gizmo, thorns, orb ( seems like most prefer orb over gizmo?) sword-guy: underground blades, rockfall, wall, sword
reaper: timeback, black hole, rage drain, soul drain ( with warrior i would trade placed rage- and soul-drain. )