Quicksilver Elemental [Mirrodin] Eldritch Moon Prerelease Promos you may put Nether Shadow

you may put Nether Shadow onto the battlefield

At the beginning of enchanted player's upkeep

that player discards a card instead

Set: From the Vault: Twenty Type: Legendary Planeswalker — Jace Rarity: Mythic Cost: {2}{U}{U} +2: Look at the top card of target player's library

Lord of Leaves

Quicksilver Elemental [Mirrodin] Eldritch Moon Prerelease Promos you may put Nether ShadowSet: Mirrodin Type: Creature Elemental Rarity: Rare Cost: {3}{U}{U} {U}: Quicksilver Elemental gains all activated abilities of target creature until end of turn. (If any of the abilities use that creature's name, use this creature's name instead.) You may spend blue mana as though it were mana of any color to pay the activation costs of Quicksilver Elemental's abilities.