When I can have one arena run with 9 gold 9 Silver and 8 Bronze, and another run with 3 gold 9 silver and 14 Bronze, there is too much RNG determining success (the reason I think many people choose Gwent is the lower factor of RNG). I can understand if you want a rarity fluctuation of 3-4 cards max. But a variance of 6 golds between really lucky and really unlucky is too steep.