Lurking Evil

Pay half your life, rounded up: This enchantment becomes a 4/4 Phyrexian Horror creature with flying.

Rowan, Scion of War

Menace
{T}: Spells you cast this turn that are black and/or red cost {X} less to cast, where X is the amount of life you lost this turn. Activate only as a sorcery.

Blood Celebrant

{B}, Pay 1 life: Add one mana of any color.

Mischievous Poltergeist

Flying
Pay 1 life: Regenerate this creature.

Festival of Embers

During your turn, you may cast instant and sorcery spells from your graveyard by paying 1 life in addition to their other costs.
If a card or token would be put into your graveyard from anywhere, exile it instead.
{1}{R}: Sacrifice this enchantment.

Carrion Howler

Pay 1 life: This creature gets +2/-1 until end of turn.

Marrow Bats

Flying
Pay 4 life: Regenerate this creature.

Deepwood Ghoul

Killing Wave

For each creature, its controller sacrifices it unless they pay X life.