Karn, Legacy Reforged (Retro) [March of the Machine: The Aftermath] WTR141-C Elves you control have “{T}:

Elves you control have “{T}: Add {G}{G}

If it's yellow

a hero bolts to the rescue

Set: The Lord of the Rings: Tales of Middle-Earth Type: Creature — Wraith Knight Rarity: Uncommon Cost: {2}{B} Deathtouch

T: Choose a player with the most life or tied for most life

Karn, Legacy Reforged (Retro) [March of the Machine: The Aftermath] WTR141-C Elves you control have “{T}:Set: 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.