Narset, Enlightened Master [Khans of Tarkir Prerelease Promos] Human Cleric if you control the artifact

if you control the artifact with the highest mana value or tied for the highest mana value

sacrifice Serendib Djinn

Set: Kaladesh Prerelease Promos Type: Land Rarity: Rare Spirebluff Canal enters the battlefield tapped unless you control two or fewer other lands

Enchanted Wall can attack as though it didn't have defender

elvish safewright

Narset, Enlightened Master [Khans of Tarkir Prerelease Promos] Human Cleric if you control the artifactSet: Khans of Tarkir Prerelease Promos Type: Legendary Creature Human Monk Rarity: Mythic Cost: {3}{U}{R}{W} First strike, hexproof Whenever Narset, Enlightened Master attacks, exile the top four cards of your library. Until end of turn, you may cast noncreature spells from among those cards without paying their mana costs.