Karn's Sylex (Promo Pack) [Dominaria United Promos] Phyrexian Zombie Knight Set: Magic Player Rewards 2009

Set: Magic Player Rewards 2009 Type: Instant Rarity: Rare Cost: {1}{U} Counter target noncreature spell

or you can take one of three other actions:

Set: Collectors' Edition Type: Artifact Rarity: Rare Cost: {4} Nevinyrral's Disk enters the battlefield tapped

Set: Shadows over Innistrad Prerelease Promos Type: Land // Legendary Creature — Demon Rarity: Rare {T}: Add {C}

Karn's Sylex (Promo Pack) [Dominaria United Promos] Phyrexian Zombie Knight Set: Magic Player Rewards 2009Set: Dominaria United Promos Type: Legendary Artifact Rarity: Mythic Cost: {3} Karn's Sylex enters the battlefield tapped. Players can't pay life to cast spells or to activate abilities that aren't mana abilities. {X}, {T}, Exile Karn's Sylex: Destroy each nonland permanent with mana value X or less. Activate only as a sorcery.