Valve did a great job on this game, they sure learnt a lot from MTG
The RNG is just about right to keep each game different and fun, but will rarely be the key factor of a win/loss
Currently, the game is in a closed beta state, and have some features missing (would be great to be able to see your MMR)
But it does look like a finished game already, beautiful, competitive, polished and FAIR!!
It is a Pay to Play game, but not a Pay to Win game, meaning that you can not spend thousands of dollars to have better win rate over people who spent a bit less. That said, you do need to spend at least a few hundred dollars to complete your collection if you really want to be playing in a competitive constructed level

BTW I'm going to bring the TI title to my country (BRAZIL)! So if you are looking at this game thinking you can put your hands in the million dollar prize pool, forget it! It already have an owner, ME! <3