The former allowed your eyes to enjoy something other than cards being placed on mats, and the latter is awesome for replayability.
Starter Deck Contains: 1x 50-Card Deck
If you're designing your own cards through QPMNs custom playing card services , you can replicate these finishes with available print options or even apply hot and cold stamping techniques as described in their guide on foil stamping
Some sets are known for kicking off chase events in the collectors' community, while others do a good job of reprinting cards that players need to be competitive
Some players go about this with burn cards, i.e
Underground Expedition once sat below the $30 ceiling, but broke through in a big way, catapulting up into the mid-30s, a significant surge for a card in this price range