Hero and Saga are subtypes, not card types
This works with all permanent types, and means that if you sacrifice a treasure token, you not only get the mana from the token itself, but Korvold gets stronger - and you draw a card, too
Most of the reprints are mono-colored (14 of 24), but the heavy multicolor trend in new commanders might reflect a recent trend of the most popular commanders being three or more colors
This one, however, seems like itll be worth it
Most decks run a bit more targeted removal than board wipes since theyre cheaper and more versatile
Cards like Endurance and Faerie Mastermind also serve as subtle interaction, either shuffling away graveyards or drawing you extra cards while they punish opponents