Karn, the Great Creator (Japanese Alternate Art) [War of the Spark Promos] Trainer you may spend mana as

you may spend mana as though it were mana of any type to pay that spell's mana cost

Set: Sword & Shield: Black Star Promos Type: Lightning Rarity: Promo Retreat cost: 0

Set: Sun & Moon: Forbidden Light Type: Water Rarity: Ultra Rare Retreat cost: Colorless

Set: Duelist League Promo Card type: Normal Monster Rarity: Rare Attack: 200 Defense: 300

1 Rogue's Passage

Karn, the Great Creator (Japanese Alternate Art) [War of the Spark Promos] Trainer you may spend mana asSet: War of the Spark Promos Type: Legendary Planeswalker Karn Rarity: Rare Cost: {4} Activated abilities of artifacts your opponents control can't be activated. +1: Until your next turn, up to one target noncreature artifact becomes an artifact creature with power and toughness each equal to its mana value. 2: You may reveal an artifact card you own from outside the game or choose a face up artifact card you own in exile. Put that card into your hand.