You see, power less than 5 means 1, 2, 3 & 4
It has 204 unique, numbered cards in the main set, but Dalmatian Puppy Tail Wagger came in five different versions (4a, 4b, 4c, 4d, and 4e)
Shanks (OP09-001): This is another control list
Cards like Ichor Wellspring, Mycosynth Wellspring, Servo Schematic, and similar value artifacts can replace themselves or leave material behind
People are generally fine with Expropriate from a power level perspective, even if many find it boring, but I think a plurality of decks that are power level 7 and up eschew big mana stuff because they don't need it, if you can win with Rite of the Raging Storm then you don't need Expropriate
Brotherhoods End Brotherhood's End also hits planeswalkers, but Im mostly interested in the ability to destroy small artifacts