Periodically Apple changes their tiered pricing to adjust to fluctuating currency prices. Our prices are set by pricing tiers in order for prices in local currencies to be roughly equivalent to each other. Apple is citing changes in foreign exchange rates as the reason behind the price increase.
See this link for more information: https://www.macrumors.com/2017/04/27...store-pricing/
There's a lot of very powerful characters which only do damage to a single target with one or both of their skills (Angel of Fear/Angel of Strife, Warrior/Assassin Child of the Damned, Warrior/Assassin Newborns of Light, Sentinel Corrupt Droid, and most Eddies come to mind). These characters are one of the main ways to ensure you're not getting pummeled every attack against enemies which can counterstrike. Alternatively, you can remove the buff or stun the character who can counter to put their extra hitting capabilities out of commission.
If you build a team which only attacks all enemies and don't account for enemies having Counterstrike (or the Counter/Revenge passives), that's a risk you're incurring.