Mana Drain [Legends] SM140 it becomes an Aura with

it becomes an Aura with "enchant creature put onto the battlefield with Necromancy

Set: Aether Revolt Prerelease Promos Type: Sorcery Rarity: Rare Cost: {4}{G}{G} Draw cards equal to the greatest power among creatures you control

Set: Black & White: Plasma Storm Type: Water Rarity: Secret Rare Retreat cost: Colorless

Set: Amonkhet Prerelease Promos Type: Legendary Planeswalker — Liliana Rarity: Mythic Cost: {3}{B}{B} +1: Create a 2/2 black Zombie creature token

Set: Sun & Moon: Unified Minds Type: Metal Rarity: Secret Rare Retreat cost: Colorless

Mana Drain [Legends] SM140 it becomes an Aura withSet: Legends Type: Instant Rarity: Uncommon Cost: {U}{U} Counter target spell. At the beginning of your next main phase, add an amount of {C} equal to that spell's mana value.