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Korvold's cost-reduction ability doesn't affect the colored mana in its mana cost

Other Garruk Wildspeaker Planeswalker CMC: Color Identity: Green Commander Legacy Modern Vintage Legendary Ramp Untap Nissa, Who Shakes the World Planeswalker Mana: Additional CMC: Fetch Color Identity: Green Mana: Green Commander Historic Legacy Modern Pioneer Vintage Legendary Ramp Untap Nissa, Worldwaker Planeswalker Basic Fetch CMC: Fetch Color Identity: Green Commander Legacy Modern Pioneer Vintage Legendary Ramp Untap

Beyond that, I have no idea what it's about

If you use them too often, you may find fewer resources to work with

Once per battle, during the Battle Step, if it is attacked by an opponent's monster with higher ATK: You can inflict damage to your opponent equal to the difference between the attacking monster's ATK and the targeted monster's