One of the advantage of having guild is players could participate Brawl. Brawl is a team work. If the guild has more experienced and active players, the guild may win better reward of every brawl. I think guild management is very important for the guild's growth. After new ranked system, the guild's importance is increasing. My guild is ok and I am an active member, so I could open Gladius Case periodically; anyway, I am just not lucky this time; one Rare card and nothing is special.
Using blood stone and guild stone could incerase chance for a better reward, but players need to spend lots of resourece to upgrade their guild.
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