I guess you’re talking about Milena. Eh it’s a small 15% heal, which is barely anything. 1st charge is essentially very fast speed, so this is identical to Grazul’s 15% heal, except she gives ailment block rather than cleanse, which is arguably better since it preempts any negative effects.
Or look at Garnet, 1st charge is again very fast, but she gives 180 HP overheal, or 12.5% overheal assuming 1450 HP average across all 5* AND ailment block. Now that is truly OP.
Yes the passives look kinda OP on first glance, until you read the fine print and realize they can be triggered at 200% mana only. Essentially for the passive abilities to proc, you’d have to use them as if they were slow heroes.
Certainly there is another power spike with these magic heroes no doubt, but I don’t feel any of them stand out as being OP or gamebreaking, well maybe Cristobal potentially:
1st charge essentially acts as a stronger green Kage, 2nd charge is a green Fenrir but to all. 2nd charge could potentially one shot the whole team IF everybody else has already been weakened to <50% HP somehow.