When 70% of instants and sorceries in my cube are 1 or 2 mana and the average CMC of such cards is about 2.5 (realistically a lot lower as so many of the high cost cards have delve or pitch and alternate costs) you start to appreciate how good four mana and higher spells must be
For decks that want access to board wipes, this should be an appealing choice
A lot of these commanders have some kind of synergy with other cards that are more group slug-ish themselves
Combine that with Ripple (good luck getting multiple copies), Recover (a very weak mechanic) and Rune Snag cycle, you just don't have a good likelihood of opening something relevant
Like, Eldrazi aside this is absolutely nuts assuming you have enough of a power curve/make small enough tokens to trigger evolve on them often
Callidus Assassin AND Necron Deathmark with a shout out to Primaris Eliminator Ever since Nekrataal was printed to introduce ETB dorks way back in Visions, this ability on a stick has been beloved, and we've had entries like Shriekmaw and Ravenous Chupacabra that have improved on it since