The idea is that each set will have a specific card that will be the card that you want to pull, and a card with chase variants to look for
So, it's that much tougher to find a given version of Nazgul, and players who wish to collect all nine will have to pay top dollar for them
This card is for when a player has attacked with all of their creatures and used all their attack spells, and need that last bit of damage to finish off the opponent
Thankfully, you are not required to read every single edition if you want to keep up with things, since they also have searchable rules databases, so you can just input the card you have a question about and expect the computer to do all the hard work of searching for and spitting out the answers
Getting to your big plays a turn early is excellent, and coming down on turn one is even more so