Voltron decks often feature glass cannons, so you want to kill opponents as quickly as possible
And while she's great (and reasonably popular) as a commander because she's cheap and her attack trigger is one of the best in the format, those same characteristics make her valuable as a card in the 99 as well
Its an event where you draft with seven other human players, build your deck, and play three best-of-three matches with sideboards
Finally, the fact that the creature Self-Destruct targets actually sees it resolving is a big deal in current Standard
Graveyard Overdrive sparked some amount of joy when I saw the lhurgoyf package, so this one wins the fun category, though Im pretty unenthused by everything thats not the lhurgoyf stuff
Dyadrine Mechan, they/them Abandoned on an uncharted moon with limited mineral deposits, Dyadrine discovered that their nanotech self-repair protocols quickly ran out of applicable materials