This spell costs less to cast, where X is your devotion to black. (Each in the mana costs of permanents you control counts toward your devotion to black.)
Destroy target creature.

Elvish Reclaimer gets +2/+2 as long as there are three or more land cards in your graveyard.
, , Sacrifice a land: Search your library for a land card, put it onto the battlefield tapped, then shuffle your library.

Whenever Emperor's Vanguard deals combat damage to a player, it explores. (Reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on this creature, then put the card back or put it into your graveyard.)

Prowl (You may cast this spell for its prowl cost if you dealt combat damage to a player this turn with a Sphinx or a Rogue.)
Flying
When Enigma Thief enters the battlefield, for each opponent, return up to one target nonland permanent that player controls to its owner's hand.

: Regenerate another target Elf.
: Elf creatures you control get +3/+3 and gain trample until end of turn.

Destroy target attacking or blocking creature.

As an additional cost to cast this spell, pay 5 life or sacrifice a creature or enchantment.
Destroy target creature.

[+1]: Destroy another target planeswalker.
[+1]: Create a 3/3 black Beast creature token with deathtouch.
[−3]: Destroy target creature. You gain life equal to its toughness.
[−8]: Target opponent gets an emblem with "Whenever a creature attacks you, it gets +5/+5 and gains trample until end of turn."

When Ghirapur Gearcrafter enters the battlefield, create a 1/1 colorless Thopter artifact creature token with flying. (A creature with flying can't be blocked except by creatures with flying or reach.)

Whenever Goblin Snowman blocks, prevent all combat damage that would be dealt to and dealt by it this turn.
: Goblin Snowman deals 1 damage to target creature it's blocking.

: Choose target artifact a player controls and target artifact card in that player's graveyard. If both targets are still legal as this ability resolves, that player simultaneously sacrifices the artifact and returns the artifact card to the battlefield.

Hagra Broodpit enters the battlefield tapped.
: Add .

This spell costs less to cast if an opponent controls no basic lands.
Destroy target creature.

Whenever Hammer of Nazahn or another Equipment enters the battlefield under your control, you may attach that Equipment to target creature you control.
Equipped creature gets +2/+0 and has indestructible.
Equip

Shuffle your library, then exile the top four cards. You may cast any number of spells with converted mana cost 5 or less from among them without paying their mana costs. Lands you control don't untap during your next untap step.

When Hero of the Nyxborn enters the battlefield, create a 1/1 white Human Soldier creature token.
Whenever you cast a spell that targets Hero of the Nyxborn, creatures you control get +1/+0 until end of turn.

Gain control of target artifact or creature until end of turn. Untap it. It gains haste until end of turn.

Enchant creature you control
When Iroas's Blessing enters the battlefield, it deals 4 damage to target creature or planeswalker an opponent controls.
Enchanted creature gets +1/+1.

Exile target permanent with converted mana cost 1.

Jaya's Greeting deals 3 damage to target creature. Scry 1.