if you want to win rare cards of a certain guild you have to play against a boss of that guild
because there is no stonelinker boss you have to play against mercenary bosses or the boss of the zahal campaing, they give rares of any guild, included stonelinkers (with bad luck you will get rares of another guilds)
any mission of any campaing can drop any common or uncommon cards (and favors)
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