Ravnica Remastered

Sorcery

Reveal a card from your hand. Search your library for a card with the same name as that card, reveal it, put it into your hand, then shuffle.
Hellbent — If you have no cards in hand, instead search your library for a card, put it into your hand, then shuffle.

Infernal Tutor

Demonfire deals X damage to any target. If a creature dealt damage this way would die this turn, exile it instead.
Hellbent — If you have no cards in hand, this spell can't be countered and the damage can't be prevented.

Demonfire

Creature — Dragon

{R}{R}: This creature gains flying until end of turn.
{R}: This creature gets +1/+0 until end of turn.
Hellbent — This creature has double strike as long as you have no cards in hand.

Rakdos Pit Dragon

Enchantment — Aura

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

Taste for Mayhem

Creature — Rat

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.)

Gobhobbler Rats

Modern Horizons 2

Creature — Bird Spirit

Flying
Hellbent — This creature has lifelink as long as you have no cards in hand.
{B}, Discard a card: This creature gains indestructible until end of turn. Tap it.

Necromancer's Familiar

Instant

Target creature gets -3/-3 until end of turn.
Hellbent — That creature gets -13/-13 until end of turn instead if you have no cards in hand.

Tragic Fall

Time Spiral Remastered

Creature — Human Rogue

Hellbent — This creature has shadow as long as you have no cards in hand. (It can block or be blocked by only creatures with shadow.)

Cutthroat il-Dal

Morph

Creature — Human Warrior

Hellbent — This creature gets +2/+2 as long as you have no cards in hand.
Morph—Discard a card. (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)

Gathan Raiders

Modern Horizons

Creature — Specter

Flying
Hellbent — Whenever this creature deals combat damage to a player, if you have no cards in hand, that player discards a card at random.

Headless Specter

Creature — Sliver

Hellbent — As long as you have no cards in hand, Sliver creatures you control have "{T}: This creature deals 1 damage to target player or planeswalker."

Bladeback Sliver

RNA Guild Kit

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

Cackling Flames

Creature — Ogre Warrior

Whenever this creature is dealt damage, discard that many cards.
Hellbent — Whenever this creature deals combat damage to a player, if you have no cards in hand, that player discards cards equal to the damage.

Jagged Poppet

Duel Decks Anthology: Divine vs. Demonic

Creature — Imp

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

Demon's Jester

Duel Decks Anthology: Jace vs. Chandra

Land

This land enters tapped.
{T}: Add {R}.
Hellbent — {1}{R}, {T}: This land deals 1 damage to any target. Activate only if you have no cards in hand.

Keldon Megaliths

Future Sight

Enchantment

At the beginning of each player's upkeep, that player loses 1 life and discards a card.
Hellbent — Skip your upkeep step if you have no cards in hand.
Madness {2}{B}{B} (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)

Gibbering Descent

Dissension

{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.

Nihilistic Glee

Creature — Zombie Cleric

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

Ragamuffyn

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

Slaughterhouse Bouncer

Creature — 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.

Slithering Shade

Whenever a creature you control attacks, it gets +2/+0 until end of turn and this enchantment deals 1 damage to you.
Hellbent — As long as you have no cards in hand, if a source you control would deal damage to a permanent or player, it deals double that damage to that permanent or player instead.

Anthem of Rakdos

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