Karn, Legacy Reforged (Retro) [March of the Machine: The Aftermath] Enchantment you may search your library

you may search your library for a Spirit permanent card

Set: Modern Horizons 2 Type: Creature — Human Wizard Rarity: Common Cost: {5}{R} When Revolutionist enters the battlefield

Set: Mystery Booster Type: Legendary Creature — Human Rogue Rarity: Rare Cost: {2}{U}{U} You may have Sakashima the Impostor enter the battlefield as a copy of any creature on the battlefield

Set: San Diego Comic-Con 2018 Type: Legendary Planeswalker — Liliana Rarity: Mythic Cost: {2}{B}{B} +1: Mill three cards

or card from “The List” (a special card from Magic's history—found in 25% of packs)

Karn, Legacy Reforged (Retro) [March of the Machine: The Aftermath] Enchantment you may search your librarySet: 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.