>>536454843
Merlin helps ensure all crit chains wipe a wave/bar. This includes NPAA or BNPB for a duo. Oberon is an NP damage finisher, which is always useful for all card types, but Olga's NP damage is nothing special and she doesn't struggle with refill thanks to full charge, 20% refund, and her skill CD. Which leaves room for more crit buffs to fight against retarded HP bloat.