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At first, I thought this might have something to do with the order that the decks were previewed (in theory, decks that are previewed first will have more time for their cards to decrease in price), but considering Sultai Morph was the first decklist released, this doesn't seem to be the case

Angelic Renewal Astrid Peth Blood Spatter Analysis Case of the Uneaten Feast Cauldron of Essence Chorale of the Void Colfenor's Urn Desert Warfare Dogmeat, Ever Loyal Emperor of Bones Everquill Phoenix Everquill Phoenix Falkenrath Forebear Farid, Enterprising Salvager Fell Shepherd Gate to the Afterlife General Kudro of Drannith Grim Reaper's Scythe Harald Unites the Elves Jinxed Ring Kibo, Uktabi Prince Knights' Charge Krenko, Baron of Tin Street Last Laugh Living Lore Magnetic Snuffler Ongoing Investigation Pawn of Ulamog Quest for the Gravelord Quest for the Necropolis Rakshasa Debaser Riveteers Ascendancy Samwise Gamgee Sandbender Scavengers Scavenger's Talent Sephiroth, Fallen Hero Seraph Slimefoot and Squee Soul Stair Expedition Terror Ballista The Falcon, Airship Restored The Ooze The Revelations of Ezio Thunderkin Awakener Unshakable Tail Yuma, Proud Protector

A common card that is a staple in popular formats, like an Alpha Lightning Bolt, can be worth hundreds, while countless bulk rares are worthless