When Abyssal Gatekeeper dies, each player sacrifices a creature.
1 /
1
{1}{B}{B}
Abyssal Nocturnus
Creature - Horror
Whenever an opponent discards a card, Abyssal Nocturnus gets +2/+2 and gains fear until end of turn. (It can't be blocked except by artifact creatures and/or black creatures.)
2 /
2
{2}{B}{B}
Banshee
Creature - Spirit
{X}, {T}: Banshee deals half X damage, rounded down, to any target, and half X damage, rounded up, to you.
0 /
1
{2}{B}
Drag Down
Instant
Domain -- Target creature gets -1/-1 until end of turn for each basic land type among lands you control.
{3}{B}
Magus of the Abyss
Creature - Human Wizard
At the beginning of each player's upkeep, destroy target nonartifact creature that player controls of their choice. It can't be regenerated.
4 /
3
{4}{B}{B}{B}
Peer into the Abyss
Sorcery
Target player draws cards equal to half the number of cards in their library and loses half their life. Round up each time.