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You gain wildcards by opening packs of cards (packs obtained in any way but drafting). You have a chance to get them in any pack, but you are guaranteed to get at least one mythic wildcard every 24 packs, 1 rare wildcard every 6 packs, and I don’t recall the other percentages. You also get ‘vault progress’ when you obtain a 5th or more duplicate of a card. Unlocking the vault obtains you a few more wildcards, but it takes a ton of duplicates to open it, so I’m only mentioning it for completeness.
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