honestly, i kinda advice you to still take a look into it, the considerations of Viridel are true but as he even mention, it's a debate on the "aiming to be elite" matter.
(i hate the new drow legendary aswell ;P ), but before was the problem of the mummy dropped (you can counter a 1st round legendary drow with a blue drow so it's not like it's impossible to get rid of)

Sure there are people dropping shitload of money into the game, and those will have a huge edge above you, still doesnt mean you wont get legendary cards or enjoy the game (that again, is better then any nutaku current game let's be honest)....

Of course if you are looking for a game where competition is the number one factor, that require no money involvement to reach top rank, and so on....... i would kinda avoid all browser games whatsoever.

If your are looking for an enjoyable game that give you fun and it can still be played with no money or with the option to give you a good boost with a 1$ or 5 bucks
pack then go for it.