Revenge: grey out if not available

Hello


First of all congrats on the new update, great job at keeping the game fresh!

Have you considered making revenge a little easier?
At the moment it's a bit painful to go through the list to see who's both not online and available for revenge. Because of the time it takes and lack of loot bonus (at least for master's league players and up) I almost never use it, and I suspect I'm not the only one.

Perhaps the revenge button could only be active/visible when the player can actually be attacked at that moment?

Cheers
B.