An essential and extremely versatile unit in the Shadow Elves arsenal, this card fulfills two roles.
One as a combat unit. With the great statline of 3/4 for 2 cost, it is a great combat unit on its own. But Shadow Mage is also a support unit. It’s ability wouldn’t be that great in other decks and even a drawback, but the self-damage ability of Shadow Mage helps to fuel Selundar’s ability. The card draw is just icing on the cake.
The unit also has one extra use: to take down gates. Its ability also works on enemy gates, which is good to open assassination paths, help reduce the opponent’s summoning points or just allows you to use Shadow Pulse. In combination with the other commons, you can see how Shadow Elves have the tools to push, threaten enemy gates and clog opponent factions.