Scholar of Athreos | Creature | Human Cleric | {2}{B}: Each opponent loses 1 life. You gain life equal to the life lost this way. | Cynthia Sheppard
Agent of the Fates | Creature | Human Assassin | Deathtouch
Heroic — Whenever you cast a spell that targets Agent of the Fates, each opponent sacrifices a creature. | Matt Stewart
Blood-Toll Harpy | Creature | Harpy | Flying
When Blood-Toll Harpy enters the battlefield, each player loses 1 life. | Kev Walker
Felhide Minotaur | Creature | Minotaur | | Kev Walker
Hero's Downfall | Instant | | Destroy target creature or planeswalker. | Ryan Pancoast
Mogis's Marauder | Creature | Human Berserker | When Mogis's Marauder enters the battlefield, up to X target creatures each gain intimidate and haste until end of turn, where X is your devotion to black. (A creature with intimidate can't be blocked except by artifact creatures and/or creatures that share a color with it. Each {B} in the mana costs of permanents you control counts toward your devotion to black.) | Chase Stone
Nighthowler | Enchantment Creature | Horror | Bestow {2}{B}{B} (If you cast this card for its bestow cost, it's an Aura spell with enchant creature. It becomes a creature again if it's not attached to a creature.)
Nighthowler and enchanted creature each get +X/+X, where X is the number of creature cards in all graveyards. | Nils Hamm
Read the Bones | Sorcery | | Scry 2, then draw two cards. You lose 2 life. | Lars Grant-West
Ashiok, Nightmare Weaver | Legendary Planeswalker | Ashiok | +2: Exile the top three cards of target opponent's library.
−X: Put a creature card with mana value X exiled with Ashiok, Nightmare Weaver onto the battlefield under your control. That creature is a Nightmare in addition to its other types.
−10: Exile all cards from all opponents' hands and graveyards. | Karla Ortiz