Primal Vigor [Commander 2013] Karn Noncreature spells with {X} in

Noncreature spells with {X} in their mana costs can't be cast

we were able to convert sky-dock assisters into a defense system for the Aether Spire

Set: Amonkhet Invocations Type: Sorcery Rarity: Mythic Cost: {R} Chain Lightning deals 3 damage to any target

Spells your opponents cast cost {1} more to cast

Primal Vigor [Commander 2013] Karn Noncreature spells with {X} inSet: Commander 2013 Type: Enchantment Rarity: Rare Cost: {4}{G} If one or more tokens would be created, twice that many of those tokens are created instead. If one or more +1 +1 counters would be put on a creature, twice that many +1 +1 counters are put on that creature instead.