Like most Magic: The Gathering cards, the value of Gix, Yawgmoth Praetor depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (The Brothers' War Promos)
As these cards do not have any additional effect in the game their being Gold Crown cards is only an aesthetic change
You can kill an opposing creature and reanimate one of yours, for example
You can obtain the Surskit (1-Diamond rarity) card by opening Paradox Drive from Paradox Drive set
Training Grounds affects only creatures you control on the battlefield
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