Taste for Mayhem

Enchant creature
Enchanted creature gets +2/+0.
Hellbent — Enchanted creature gets an additional +2/+0 as long as you have no cards in hand.

Rix Maadi, Dungeon Palace

{T}: Add {C}.
{1}{B}{R}, {T}: Each player discards a card. Activate only as a sorcery.

Mountain

Rakdos Ickspitter

{T}: This creature deals 1 damage to target creature and that creature's controller loses 1 life.

Torpid Moloch

Defender (This creature can't attack.)
Sacrifice three lands: This creature loses defender until end of turn.

Douse in Gloom

Douse in Gloom deals 2 damage to target creature and you gain 2 life.

Rakdos Guildmage

({B/R} can be paid with either {B} or {R}.)
{3}{B}, Discard a card: Target creature gets -2/-2 until end of turn.
{3}{R}: Create a 2/1 red Goblin creature token with haste. Exile it at the beginning of the next end step.

Slaughterhouse Bouncer

Hellbent — When this creature dies, if you have no cards in hand, target creature gets -3/-3 until end of turn.

Cackling Flames

Cackling Flames deals 3 damage to any target.
Hellbent — Cackling Flames deals 5 damage instead if you have no cards in hand.

Rakdos Signet

Ignorant Bliss

Exile all cards from your hand face down. At the beginning of the next end step, return those cards to your hand, then draw a card.

Slithering Shade

Defender (This creature can't attack.)
{B}: This creature gets +1/+1 until end of turn.
Hellbent — This creature can attack as though it didn't have defender as long as you have no cards in hand.

Seal of Fire

Sacrifice this enchantment: It deals 2 damage to any target.

Sadistic Augermage

When this creature dies, each player puts a card from their hand on top of their library.

Twinstrike

Twinstrike deals 2 damage to each of two target creatures.
Hellbent — Destroy those creatures instead if you have no cards in hand.

Wrecking Ball

Drekavac

When this creature enters, sacrifice it unless you discard a noncreature card.

Ragamuffyn

Hellbent — {T}, Sacrifice a creature or land: Draw a card. Activate only if you have no cards in hand.

Lyzolda, the Blood Witch

{2}, Sacrifice a creature: Lyzolda deals 2 damage to any target if the sacrificed creature was red. Draw a card if the sacrificed creature was black.

Demon's Jester

Flying
Hellbent — This creature gets +2/+1 as long as you have no cards in hand.

Swamp

Nihilistic Glee

{2}{B}, Discard a card: Target opponent loses 1 life and you gain 1 life.
Hellbent — {1}, Pay 2 life: Draw a card. Activate only if you have no cards in hand.

Scorched Rusalka

{R}, Sacrifice a creature: This creature deals 1 damage to target player or planeswalker.

Gobhobbler Rats

Hellbent — As long as you have no cards in hand, this creature gets +1/+0 and has "{B}: Regenerate this creature." (The next time it would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.)