Gold foil cards (often referred to as GF) are much more scarce than their regular counterparts. Without modifiers, chances are that 2% of the cards found in regular editions turn to gold foil. Using the alchemy potion, that chance doubles. For loot chests, this chance depends on the type of chest. More details here.
For gladius cases, the way to double the chance to receive GF gladiators is by using power stones.
Gold foil cards offer a 5% bonus on winning matches in ranked battles and much fewer are needed to upgrade to higher levels. A 1-BCX gold foil card also starts from a higher level than its regular counterpart (depending on the rarity).
In Brawls there are frays specially created for gold foil lineups. Equally, there are tournaments that require GF lineups.
Related:
Splinterlands Website
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