You can keep buying and winning decks but how often will those packs actually yield legendary cards?
The chance of getting a legendary in a pack is 5%.
This has been documented by Blizzard, and there is also lots of empirical evidence (gathered by people counting during opening of huge amounts of packs) to support this.
In addition, a pity timer guarantees at least 1 legendary in each 40 packs (and this is tracked separately for each expansion). This is not officially announced, but also backed by collected statistics.
And finally, for new expansions you are guaranteed a legendary in the first 10 packs.
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