deck box for triple sleeved cards Sleeve Commander BASTION 100+ XL - Holds

One of those free cards was one of the new Secret Rares, which apparently got a holo Attribute and Level just like the new Ultra Rares

To "collect evidence N", exile cards with total mana value N or greater from your graveyard

As you can see in the top left, this card is named Walking Corpse and its mana cost is one generic mana and one black mana (often shortened to one and a black or one black)

One contributing factor is the focus and care on the card arts specifically

Clean raw copies have been trading from the high $200s to north of $300 depending on the tracker, and the figure has moved fast, so read it as a snapshot