Expansion has launched! Results of 54 packs from 5000 Gold, 3 Tavern Packs, and 1 Arena pack:
Spoiler: Answer: a giant pile of sand
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Free Quest: Activate the Obelisk
Legendaries: Bazaar Burglary, Supreme Archaeology, Hack the System, King Phaoris
Epics: 1x Shadow of Death, 1x Plague of Murlocs, 3x Diseased Vulture, 1x Mischief Maker, 1x Blatant Decoy
Rares: 8x Hidden Oasis (6 Normal, 2 Gold), 1x Overflow, 3x Ramkahen Wildtamer, 1x Hyena Alpha, 1x Swarm of Locusts, 3x Arcane Flakmage, 2x Dune Sculptor (1N, 1G), 1x Brazen Zealot, 2x Salhet's Pride, 3x Pharaoh's Blessing, 2x Holy Ripple, 4x Wretched Reclaimer, 1x Sahket Sapper, 1x Weaponized Wasp, 2x Earthquake, 2x Mogu Fleshshaper, 2x Expired Merchant, 3x Plague of Wrath, 3x Tomb Warden, 4x Neferset Ritualist, 2x Quicksand Elemental, 1x Conjured Mirage, 2x Sunstruck Henchman, 4x Khartut Defender (3N, 1G), 2x Wrapped Golem.
Amusingly, I am 4/5 of the EVIL's quests, and have gotten zero of the new League of Explorers' cards.