Karn, Legacy Reforged (Retro) [March of the Machine: The Aftermath] Dragon Skeleton Set: Unlimited Edition Type: Instant

Set: Unlimited Edition Type: Instant Rarity: Uncommon Cost: {U} Cast this spell only during an opponent's turn

Set: Innistrad: Crimson Vow Type: Sorcery Rarity: Rare Cost: {3}{R} Discard your hand

Set: Masters 25 Type: Legendary Creature — Goblin Ally Rarity: Uncommon Cost: {3}{R} Whenever you cast an instant or sorcery spell that targets only Zada

then those players shuffle their libraries

Karn, Legacy Reforged (Retro) [March of the Machine: The Aftermath] Dragon Skeleton Set: Unlimited Edition Type: InstantSet: 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.