Necropotence [From the Vault: Exiled] SM182 you can send this card

you can send this card from your hand to the Graveyard to select 1 face-up Effect Monster your opponent controls

If this card is Special Summoned from the hand: You can target 1 face-up opponent's monster that was Special Summoned from the Extra Deck

Set: Sun & Moon: Unified Minds Type: Darkness Rarity: Ultra Rare Retreat cost: Colorless

you may have Valakut

Set: Mattel Action Figure Promos: Series 2 Card type: Effect Monster Rarity: Rare Attack: 2800 Defense: 2600 This card cannot be Normal Summoned or Set

Necropotence [From the Vault: Exiled] SM182 you can send this cardSet: From the Vault: Exiled Type: Enchantment Rarity: Mythic Cost: {B}{B}{B} Skip your draw step. Whenever you discard a card, exile that card from your graveyard. Pay 1 life: Exile the top card of your library face down. Put that card into your hand at the beginning of your next end step.