If this were a mythic rare creature in an in-universe set, it would be one of that sets chase cards and most popular commanders
For example, if you control The Ozolith ("Whenever a creature you control leaves the battlefield, if it had counters on it, put those counters on The Ozolith.") when Sin's last ability resolves, you'll put the appropriate number of each kind of counter onto both The Ozolith and the target creature
Announced at MagicCon Amsterdam on July 17, and debuting at GenCon in Indiana later this month, Mystery Booster Commander puts a fresh spin on the concept by focusing on, you guessed it, Commander
Double Header is interesting since many cards in pauper cube tend to have exactly two words, like Ulamogs Crusher and Izzet Boilerworks
As such, you see these features in Midrange or Control strategies as you can afford to have the land enter tapped
Multiple early Sahagin in particular will just outrace a majority of decks, and its not actually difficult to find expensive noncreature spells since the set is built with this theme in mind