Matchmaking so bad in this game. Why in gold rank i need to fight against platinum, diamond, mythic, etc again and again and again. You need deside one - pairs with similar MMR or (OR) pairs inside one rank. Not both of this!!! Or, maybe, full random pairs, like tournaments in real life.
Why dont use MMR in Mythik rank only? I dont know. Just stop make games between different ranks, or make every game between random ranks, or do something with this matchmaking.
Another bored thing - matchmaking every time trying to find mirrors or similar cards or countercards. This not real mtg expirience. Its just very (VERY) bad algorythm. I take flyers - and playing agains flyers/wrath. Take demons - playing against demons. Take monored - playing against monored/white lifegain. Every one-second-third match!!! For years in Arena. Its just WRONG!!!