Karn, Legacy Reforged (Foil Etched) [March of the Machine: The Aftermath] March of the Machine but no green thing grew

but no green thing grew there in the latter days of Saruman

then create X Treasure tokens

"The Realm of Sauron is ended forever

Set: Secret Lair Drop Series Type: Artifact Creature — Construct Rarity: Rare Cost: {X}{X} Walking Ballista enters the battlefield with X +1/+1 counters on it

if you cast it from your hand

Karn, Legacy Reforged (Foil Etched) [March of the Machine: The Aftermath] March of the Machine but no green thing grewSet: March of the Machine: The Aftermath Type: Legendary Artifact Creature Golem Rarity: Mythic Cost: {5} Karn, Legacy Reforged's power and toughness are each equal to the greatest mana value among artifacts you control. At the beginning of your upkeep, add C for each artifact you control. This mana can't be spent to cast nonartifact spells. Until end of turn, you don't lose this mana as steps and phases end.