Into the Maw of Hell

Destroy target land. Into the Maw of Hell deals 13 damage to target creature.

Avatar of Slaughter

All creatures have double strike and attack each combat if able.

Rain of Gore

If a spell or ability would cause its controller to gain life, that player loses that much life instead.

Mogis, God of Slaughter

Indestructible
As long as your devotion to black and red is less than seven, Mogis isn't a creature.
At the beginning of each opponent's upkeep, Mogis deals 2 damage to that player unless they sacrifice a creature of their choice.

Anger of the Gods

Anger of the Gods deals 3 damage to each creature. If a creature dealt damage this way would die this turn, exile it instead.

Iron Maiden

At the beginning of each opponent's upkeep, Iron Maiden deals X damage to that player, where X is the number of cards in their hand minus 4.