2023-09-01 : Korvold's cost-reduction ability doesn't affect the colored mana in its mana cost. It can't reduce its cost to less than {B}{R}{G}.

2023-09-01 : The cost-reduction ability of Korvold, Gleeful Glutton doesn't change its mana cost or mana value, only the total cost you pay. Specifically, the mana value of Korvold, Gleeful Glutton is always 8.

2023-09-01 : The permanent types are artifact, battle, creature, enchantment, land, and planeswalker. Things like "legendary" or "snow" are supertypes, not types. "Token" is not a type.