Docs: added link to testing mode documentation
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XMage allows you to play Magic against one or more online players or computer opponents.
-It includes full rules enforcement for over **20 000** unique cards and ~50.000 reprints from different editions.
+It includes full rules enforcement for over **20 000** unique cards and more than 50.000 reprints from different editions.
You can also find custom sets like Star Wars. All regular sets have nearly all implemented cards.
It's support single matches and tournaments with dozens game modes like duel, multiplayer, standard, modern, commander,
pauper, oathbreaker, historic, freeform and much more.
+Local server supports a [special test mode](https://github.com/magefree/mage/wiki/Development-Testing-Tools) for
+testing combos and other game situations with pre-defined conditions.
+
There are [public servers](http://xmageservers.online/) where you can play XMage against other players.
You can also host your own server to play against the AI and/or your friends.
