Karn, the Great Creator (Japanese Alternate Art) [War of the Spark Promos] HGSS24 that land doesn't untap during

that land doesn't untap during its controller's next untap step

these old things

You may play a card from exile with a discovery counter on it this turn

Set: Throne of Eldraine Promos Type: Legendary Artifact — Equipment Rarity: Mythic Cost: {4}{R}{R} Flash

you may cast the copy without paying its mana cost

Karn, the Great Creator (Japanese Alternate Art) [War of the Spark Promos] HGSS24 that land doesn't untap duringSet: 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.