Snuff Out

If you control a Swamp, you may pay 4 life rather than pay this spell's mana cost.
Destroy target nonblack creature. It can't be regenerated.

Dark Ritual

Target player draws two cards and loses 2 life.

Death's Shadow gets -X/-X, where X is your life total.

At the beginning of your upkeep, reveal the top card of your library and put that card into your hand. You lose life equal to its mana value.

({B/P} can be paid with either {B} or 2 life.)
Target creature gets -5/-5 until end of turn.

Target player reveals their hand. You choose a nonland card from it. That player discards that card. You lose 2 life.

As Agadeem, the Undercrypt enters, you may pay 3 life. If you don't, it enters tapped.
{T}: Add {B}.

Return from your graveyard to the battlefield any number of target creature cards that each have a different mana value X or less.

At the beginning of your upkeep, discard a card.

Target player discards two cards at random.

Imprint — When Chrome Mox enters, you may exile a nonartifact, nonland card from your hand.
{T}: Add one mana of any of the exiled card's colors.