Maybe they were of the same creature type, or showed a similar creative element, or just played well together
Sol'kanar the Swamp King is a legend from Legends that weighs in at five power, five toughness, and five converted mana cost
Once a split second spell resolves, the stack can resolve as normal or be responded to again
In Saga draft, it was a neat trick with Horseshoe Crab, creating what was known as "the Machine Gun." In Odyssey Block, it was said that if you didn't have at least one Psionic Gift in your white-blue deck, you didn't have a good white-blue deck
We have a very reasonable fair game combined with the capacity to cheat a game-warping permanent onto the battlefield
Mindcrank and Mothman Egg also feed into The Wise Mothman's bottom ability, which puts a +1/+1 counter on each of up to X creatures where X is the number of nonland cards milled