>>527674719
700 packs to build one deck it's correct though
>Legendary pull rate is 1.500%
>Gold pull rate is 6.000%
>A single deck needs 9 Legendary on average (3 playsets)
>A single deck needs 15 Golds on average (5 playsets)
>There's 7 classes (plus neutral) diluting the card pool
>You can't vial what you get until you have full playset
You actually need to open around 743 card packs of any given expansion on average to get enough cards to build a single deck