Myr Retriever

When this creature dies, return another target artifact card from your graveyard to your hand.

Gatekeeper of Malakir

Kicker {B} (You may pay an additional {B} as you cast this spell.)
When this creature enters, if it was kicked, target player sacrifices a creature of their choice.

Dark Ritual

Grasp of Darkness

Target creature gets -4/-4 until end of turn.

Grief

Menace
When this creature enters, target opponent reveals their hand. You choose a nonland card from it. That player discards that card.
Evoke—Exile a black card from your hand.

Swamp

Go for the Throat

Heartless Summoning

Creature spells you cast cost {2} less to cast.
Creatures you control get -1/-1.

Altar of the Brood

Whenever another permanent you control enters, each opponent mills a card.

Syr Konrad, the Grim

Whenever another creature dies, or a creature card is put into a graveyard from anywhere other than the battlefield, or a creature card leaves your graveyard, Syr Konrad deals 1 damage to each opponent.
{1}{B}: Each player mills a card. (They each put the top card of their library into their graveyard.)

Balustrade Spy

Flying
When this creature enters, target player reveals cards from the top of their library until they reveal a land card, then puts those cards into their graveyard.