Legality depends on the tournament format -- Hornet's Sting can be legal in some formats and banned or restricted in others
If you were to ask me which bird creature has been the most aggressive over the history of the game, it'd be hard for me to ignore all those games where my opponents did 12 trampling damage to me out of nowhere with Slickshot Show-Off and Monstrous Rage
Cargo-cult deckbuilding is when you copy a template because someone made a clean infographic, and you never ask what problem those numbers were solving
For cores we have seen the traditional blue core, black cores, and no core (aka token stock)
Potatoes are the cards that set up the payoff
If you love the depicted scene, want six playable versions of the cards, and a way to display art cards, Id say theyre worth it, especially if you can find a sale under $40