What level are you talking about op?
Before 8 shams have basically no mana regen and will melee as well as a warrior. After that if they have a few spells to cast they might as well stand next to the mob and get a swing in between spells. Despite being loaded with buffs, many of those buffs aren't worth the limited mana a sham has when you're lower levels. Dex when there are no procs? Stam without CH? Agi? +20 hp +3 ac inner fire? Short durations? Talisman won't stack with shielding nor IF with courage/skin spells, and ac buff is lower than cleric. It isn't a terrible idea to just buff melee with str and tank with ac imo before like 20, fire off a drowsy or a nuke, heal a bit.
24 and regen is cool. But you still don't likely need to be casting it on non melee (unless shams or necros). You still don't need to use most stat buffs. Max hp even on the tank isn't too big deal before CH. And again, depending on group many of the sham spells are overwritten anyway.
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