Like most Magic: The Gathering cards, the value of Omniscience depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Amonkhet Invocations)
Notable Cards: Reprints and $$ Notable value reprints include Adeline, Resplendent Cathar, Knight Exemplar, Hero of Bladehold, Vona, Butcher of Magan, Herald's Horn, and Vanquisher's Banner, making this the most valuable deck in terms of reprints
While a prize pack Radiant Zard may be technically worth more than another card, like @magikarp ex was saying, it may be relatively impossible to sell at that market price. @SilverShady was just saying that they would be willing to buy onejust not for that price
I am not claiming malice or deception at all here
Its worth making the effort to draft any dual lands that can tap for at least one of your main colors, since at bare minimum it upgrades Artillery Blast into bargain removal
The Master of Keys The Master of Keys is a cellarspawn who is able to use the House's doors as thresholds not just between adjacent rooms but unconnected rooms as well