The draw card option on Cryptic is a big part of that and is the equivalent of the discard on Kolghan's
With it being a market, these prices are always estimates, based on historic auction sales and other factors, so the values listed here arent ironclad
For five mana, this Artifact lets you pay two mana and tap it to roll a dice, then you have to subtract the number of cards in your hand from the result, and if the result of that is 0, you have to discard your hand
Many of the best equipment and equipment payoffs simply weren't in print at the time, like Colossus Hammer or Sigarda's Aid, and ones that were in print (Stoneforge Mystic, Puresteel Paladin) weren't included because that's how precons roll, I guess
To really get things going, permanents like Impact Tremors, Warstorm Surge, and Terror of the Peaks capitalize on Norin coming back into play