In my experience, Kroak brings a lot even if he never casts deliverance (the comet is really the one thing I want from him + the magic protection). I bring both umbral and the balewind vortex to complement this and it goes like: turn 1: comet, portal, deliverance/arcane bolt (depending on range), mystic shield on templar; turn 2: dispel everblaze comet, balewind, comet, deliverance/arcane bolt, mystic shield. As you can see, there's not much space for deliverance anyway, although it can get very useful if the enemy closes in and you have lost the incantor.
Possible alternatives: 1) add a runelord to dispel the comet (plus a nice unbind at +2); 2) add an exorcist (same price as the runelord now, lol, also gives you a second wizard to cast the comet); 3) bring a Slann (much more fragile but does everything we need); 4) more options (Sentinels) if LRL as allies is confirmed