yugioh gravekeeper's deck Yu-Gi-Oh! - Assailant (SDMA-EN013) - Structure Deck: Marik - 1st Edition 1500 If this card you control is sent to your GY Gravekeeper's Oracle Speed Duel Starter

There are two printed versions of Shadowless cards first editions can be identified by the First Edition symbol under the bottom left corner of the art, while second editions, while still Shadowless, do not have the same mark

Then, you look at their abilities and its exactly what you see on the card

There are 24 booster packs in a booster box

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