Heartless Summoning [Innistrad] Nightmare Horror instead Lightning Surge deals 6

instead Lightning Surge deals 6 damage to that permanent or player and the damage can't be prevented

Spend this mana only to cast instant or sorcery spells

You lose half your life

exile cards from the top of your library until you exile a nonland card that costs less

and you may spend mana as though it were mana of any type to cast those spells

Heartless Summoning [Innistrad] Nightmare Horror instead Lightning Surge deals 6Set: Innistrad Type: Enchantment Rarity: Rare Cost: {1}{B} Creature spells you cast cost {2} less to cast. Creatures you control get 1 1. "They won't be winning any beauty pageants, but they'll do the trick." Enslow, ghoulcaller of Nephalia