Legendary Creature — Dragon Noble
4/4
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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.
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.
Korvold's cost-reduction ability doesn't affect the colored mana in its mana cost. It can't reduce its cost to less than .
less to cast for each card type among permanents you've sacrificed this turn.