Karn, Silver Golem (Oversized) [Commander's Arsenal Oversized] 262 Set: March of the Machine:

Set: March of the Machine: The Aftermath Type: Legendary Creature — Human Shaman Rarity: Mythic Cost: {1}{U}{R} Dragon spells you cast cost 1 less to cast

choose a basic land type

Set: Black & White: Legendary Treasures Type: Colorless Rarity: Uncommon Retreat cost: Colorless

Set: HeartGold & SoulSilver: Undaunted Type: Darkness Rarity: Holo Rare Retreat cost: Colorless

At the beginning of the upkeep of enchanted enchantment's controller

Karn, Silver Golem (Oversized) [Commander's Arsenal Oversized] 262 Set: March of the Machine:Set: Commander's Arsenal Oversized Type: Legendary Artifact Creature Golem Rarity: Rare Cost: {5} Whenever Karn, Silver Golem blocks or becomes blocked, it gets 4 +4 until end of turn. {1}: Target noncreature artifact becomes an artifact creature with power and toughness each equal to its mana value until end of turn.