Borderless cards simply remove part of the card frame itself and extend the art to the outer edges of a card, whereas showcase frames are variations of the border, often with artistic flourishes that match the aesthetics of a set
Note how the mana costs, spell type, and sometimes even colors change
If you investigate the reason why a way to play a mechanic is ineffective, you can come up with ways to subvert that interaction, and build jank decks out of that
The two-cost instant can copy the next dorks spell this turn and get another if it's legendary for copies like The Ninth Doctor as well as Spark Double here
In fact, it might actually be better than Collected Company in Combo Elves, since it often hits more than just two creatures and because casting creatures rather than putting them on the battlefield allows us to draw more cards with Beast Whisperer