Continuing to hit your land drops and develop your mana into the late-game is the most important thing for green decks to do in most Cube environments, and these cards offer a lot on that front, all while, you guessed it, dying to Shock
Its so ubiquitous that its banned in every format except Commander (its a key piece in the best Commander decks) and Vintage, where its restricted to just one copy
When I was younger we called it galaxy not swirl, but at some point the marketing of cards that catch the random pattern of the holographic foil in a prominent spot on the card integrated itself in the value of the card itself
There is a staircase across from a nail salon that goes up to the card shop
The reprint value is best met with a raised eyebrow and a scowl, but maybe thats because Murders at Karlov Manor Commander set the bar so high
And since its immune to monster effects, its a tough wall for your opponent to try and break down