I thought it's worth highlighting this information because I and probably many others overlooked it in the patchnotes. You can't build your starting Duels deck with MDF cards, but you can find MDF buckets.
"Duels: Season One also begins on November 17, but tomorrow’s patch grants Duels: Early Access to everyone, introduces Whispers of the Old Gods to the pool of eligible sets, and adds Madness at the Darkmoon Faire cards to loot buckets! Once Duels: Season One begins, you’ll be able to add Madness at the Darkmoon Faire cards to your starter deck as well!"
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I thought it's worth highlighting this information because I and probably many others overlooked it in the patchnotes. You can't build your starting Duels deck with MDF cards, but you can find MDF buckets.
"Duels: Season One also begins on November 17, but tomorrow’s patch grants Duels: Early Access to everyone, introduces Whispers of the Old Gods to the pool of eligible sets, and adds Madness at the Darkmoon Faire cards to loot buckets! Once Duels: Season One begins, you’ll be able to add Madness at the Darkmoon Faire cards to your starter deck as well!"
Update: Seems like this feature was initially bugged, but it's now fixed.
"Fixed a bug where Madness at the Darkmoon Faire cards were not appearing in Duels loot buckets."
I've seen a few come up, both in buckets and discover options. It's also possible to get the other Hero Powers if you were lucky with the pre-order