Most definitely - both Proteus and Hansel see regular use in my raids, and often together if the enemy colors are right for stacking purple (Proteus & Kunchen) and green (Hansel, Caedmon, Lianna).
Proteus hits 3 and stop their mana; Hansel takes care of one of the other two heroes for a couple rounds while I charge one or the other of them up again. It’s very effective.
And if Proteus stops mana on someone who is almost full, and the timing works out right, I can get Hansel on them as soon as the mana block wears off.
Also, minor point: Proteus maxes at 707 Attack, Sabina at 699 - so tile damage is pretty much the same, slight edge to Proteus.
Good gaming!