Wut? Victor is already a good hero. Arguably, not on defense, but not everyone needs to be defensive hero. Victor is Very Fast and for that speed he raises defense of entire team by 30%, by the time most of opponents are still charging. He also does damage to one target, steals their healing (incredibly valuable against healers) and puts a dot that can be strenghtened by further applications, which is easy given his speed, which is 6 tile-charge when with LV11 Mana troop.
Personally I kept using him on offense even after getting Clarissa fully ascended because defense up and heal steal is very valuable when against attrition teams. Not saying he’s top hero or something, but he is far from weak.