If $200 still sounds like a significant amount to spend on a TCG all at once, because it is, let's break it down
At just four ink, its a relative bargain for how much this card has to offer
Karn, Legacy Reforged is at minimum a 5/5, scaling in power with more expensive artifacts but rewarding decks full of cheap artifacts by generating more mana with its upkeep trigger
Amber Ruby Racers This deck plays fast using Fix It Felix Pint Sized Hero, Vanellope von Schweetz Gutsy Go-Getter, and Taffyta Muttonfudge Sour Speedster synergy with locations to get the most out of your Sugar Rush Speedway Starting Line and Sugar Rush Speedway Finish Line
A 4/4 Golem for five mana that gets -4/+4 whenever it blocks or becomes blocked, the key appeal of Karn is the manner in which it interacts with your other artifact cards
When two cards are exiled and melded, they each leave the battlefield, then return together as one new untapped object with no relation to either of the objects that left the battlefield