Gatecrash

Horror of the Dim | Creature | Horror | {U}: Horror of the Dim gains hexproof until end of turn. (It can't be the target of spells or abilities your opponents control.) | Jack Wang

Bane Alley Broker | Creature | Human Rogue | {T}: Draw a card, then exile a card from your hand face down. You may look at cards exiled with Bane Alley Broker. {U}{B}, {T}: Return a card exiled with Bane Alley Broker to its owner's hand. | Clint Cearley

Consuming Aberration | Creature | Horror | Consuming Aberration's power and toughness are each equal to the number of cards in your opponents' graveyards. Whenever you cast a spell, each opponent reveals cards from the top of their library until they reveal a land card, then puts those cards into their graveyard. | Karl Kopinski

Dinrova Horror | Creature | Horror | When Dinrova Horror enters the battlefield, return target permanent to its owner's hand, then that player discards a card. | Johann Bodin

Duskmantle Guildmage | Creature | Human Wizard | {1}{U}{B}: Whenever a card is put into an opponent's graveyard from anywhere this turn, that player loses 1 life. {2}{U}{B}: Target player mills two cards. | Slawomir Maniak

Duskmantle Seer | Creature | Vampire Wizard | Flying At the beginning of your upkeep, each player reveals the top card of their library, loses life equal to that card's mana value, then puts it into their hand. | Kev Walker

Lazav, Dimir Mastermind | Legendary Creature | Shapeshifter | Hexproof Whenever a creature card is put into an opponent's graveyard from anywhere, you may have Lazav, Dimir Mastermind become a copy of that card, except its name is Lazav, Dimir Mastermind, it's legendary in addition to its other types, and it has hexproof and this ability. | David Rapoza

Mortus Strider | Creature | Skeleton | When Mortus Strider dies, return it to its owner's hand. | Tomasz Jedruszek

Deathcult Rogue | Creature | Human Rogue | Deathcult Rogue can't be blocked except by Rogues. | David Palumbo

Nightveil Specter | Creature | Specter | Flying Whenever Nightveil Specter deals combat damage to a player, that player exiles the top card of their library. You may play lands and cast spells from among cards exiled with Nightveil Specter. | Min Yum