Micro-transactions is -2 stars. Period. Don't care about justification. Another -2 for horrible single player; AI opponents not only blatantly cheat with card limits, but typically have wildly overpowered abilities. Couldn't care less about PvP. Actual gameplay is technically fun, and art is well done, but slow painful grind to aquire cards/champions/levels, along with getting steam-rolled by unfair mechanics, means this gets uninstalled.