They are borderless cards meant to fit together
High-class packs and special-pack formats like SV2a Pokemon Card 151 run higher SAR density (3-5 per box is common), while standard boosters like SV11B Black Bolt typically land closer to 2-3
Expect first edition copies to carry a significant premium over their unlimited counterparts, as first edition cards in MP condition fetch close to $48, with NM copies selling above $120 in most instances
It's a spinoff from the core card collection game, centered around the fun of opening card packs
Its also repeatable, unlike the blue equivalent sorcery or instant cards that give you a similar effect
With all the prepared Pokemon cards laid out face up, prepare the number of energy cards required for the "attack that requires the most energy" among the attacks each Pokemon has, and place them stacked under the Pokemon card so that the number of energy cards is visible