Slaughter [Exodus] Mountain Plains you'd need the energy of

you'd need the energy of the giant's tonic

Set: Eventide Type: Enchantment Rarity: Rare Cost: {2}{W}{W} Chroma — Each creature you control gets +1/+1 for each white mana symbol in its mana cost

sacrifice two untapped lands instead

exile the top seven cards of that player's library

Set: San Diego Comic-Con 2017 Type: Legendary Planeswalker — Jace Rarity: Mythic Cost: {3}{U}{U} +1: Scry 1

Slaughter [Exodus] Mountain Plains you'd need the energy ofSet: Exodus Type: Instant Rarity: Uncommon Cost: {2}{B}{B} BuybackPay 4 life. (You may pay 4 life in addition to any other costs as you cast this spell. If you do, put this card into your hand as it resolves.) Destroy target nonblack creature. It can't be regenerated.