First strike, haste

Discard a card at random: Hell-Bent Raider gains protection from white until end of turn.

Haste

When Hellhole Rats enters, target player discards a card. Hellhole Rats deals damage to that player equal to that card's mana value.

Improvise (Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for .)

Flying

At the beginning of your end step, each opponent discards a card.

, Sacrifice an artifact: Target creature gets -2/-2 until end of turn.

When Hidden Horror enters, sacrifice it unless you discard a creature card.

You may discard a card or sacrifice a land. If you do, draw two cards.

Plot (You may pay and exile this card from your hand. Cast it as a sorcery on a later turn without paying its mana cost. Plot only as a sorcery.)

, Discard a card: Counter target spell if it has the same mana value as the discarded card.

This spell costs less to cast for each creature card in your graveyard.

Flying

When Hollow Marauder enters, any number of target opponents each discard a card. For each of those opponents who didn't discard a card with mana value 4 or greater, draw a card.

Flying

Whenever Hollow Specter deals combat damage to a player, you may pay . If you do, that player reveals X cards from their hand and you choose one of them. That player discards that card.

When Hollowhenge Wrangler enters the battlefield, seek a land card.

Discard a land card: Conjure a card named Hollowhenge Beast into your hand. You may also activate this ability while Hollowhenge Wrangler is in your graveyard.

Each Sliver card in each player's hand has slivercycling .

Slivercycling (, Discard this card: Search your library for a Sliver card, reveal it, put it into your hand, then shuffle.)

As an additional cost to cast this spell, discard a card.

Draw two cards. Amass Zombies 1. (Put a +1/+1 counter on an Army you control. It's also a Zombie. If you don't control an Army, create a 0/0 black Zombie Army creature token first.)

Flying

Other Zombies you control have flying.

Whenever one or more Zombies you control deal combat damage to one or more of your opponents, you may draw cards equal to the number of opponents dealt damage this way. If you do, discard that many cards.

Target player discards a card, then mills a card.

When Hostile Investigator enters, target opponent discards a card.

Whenever one or more players discard one or more cards, investigate. This ability triggers only once each turn. (Create a Clue token. It's an artifact with ", Sacrifice this artifact: Draw a card.")

Cycling (, Discard this card: Draw a card.)

Create three 1/1 green Elf Warrior creature tokens.

Reinforce 3— (, Discard this card: Put three +1/+1 counters on target creature.)

Destroy all enchantments.

Cycling (, Discard this card: Draw a card.)

Kicker (You may pay an additional as you cast this spell.)

Target player discards a card. If this spell was kicked, that player discards three cards instead.

Flying

Whenever Hypnotic Specter deals damage to an opponent, that player discards a card at random.

Draw two cards. Then you may discard a nonland card. When you do, Hypothesizzle deals 4 damage to target creature.

Flying

When this creature enters, draw a card, then discard a card.

Draw three cards. Discard three cards at the beginning of the next end step.

Haste

Swampcycling , mountaincycling (, Discard this card: Search your library for a Swamp or Mountain card, reveal it, put it into your hand, then shuffle.)

Draw two cards. Then you may discard two cards. When you do, Ill-Timed Explosion deals X damage to each creature, where X is the greatest mana value among cards discarded this way.

Double strike

Whenever Illuminator Virtuoso becomes the target of a spell you control, it connives. (Draw a card, then discard a card. If you discarded a nonland card, put a +1/+1 counter on this creature.)

When Immersturm Raider enters, you may discard a card. If you do, draw a card.

Enchant creature

Enchanted creature doesn't untap during its controller's untap step.

Enchanted creature has ", Discard a card: Untap this creature."

Each player may discard their hand and draw cards equal to the greatest mana value of a commander they own on the battlefield or in the command zone.

Whenever you draw your second card each turn, create a 1/1 blue Faerie creature token with flying.

: Draw a card, then discard a card.

Choose two —

• Incendiary Command deals 4 damage to target player or planeswalker.

• Incendiary Command deals 2 damage to each creature.

• Destroy target nonbasic land.

• Each player discards all the cards in their hand, then draws that many cards.

Haste (This creature can attack and as soon as it comes under your control.)

Madness (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)

(: Add , , or .)

Indatha Triome enters tapped.

Cycling (, Discard this card: Draw a card.)

Flying

Whenever you cast a Spirit or Arcane spell, target player reveals their hand and discards all cards with that spell's mana value.

When Injector Crocodile dies, incubate 3. (Create an Incubator token with three +1/+1 counters on it and ": Transform this artifact." It transforms into a 0/0 Phyrexian artifact creature.)

Swampcycling (, Discard this card: Search your library for a Swamp card, reveal it, put it into your hand, then shuffle.)

Insatiable Gorgers attacks each combat if able.

Madness (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)

When Insidious Bookworms dies, you may pay . If you do, target player discards a card at random.

Menace (This creature can't be blocked except by two or more creatures.)

Discard a card, Sacrifice Insolent Neonate: Draw a card.

, , Discard a card: Creatures target player controls attack this turn if able.

Whenever you attack, you may discard a card. When you do, put a +1/+1 counter on target attacking creature. It gains trample until end of turn.

Whenever you discard one or more cards, exile the top card of your library. You may play that card until your next end step.

(As a Siege enters, choose an opponent to protect it. You and others can attack it. When it's defeated, exile it, then cast it transformed.)

When Invasion of Amonkhet enters, each player mills three cards, then each opponent discards a card and you draw a card. (To mill three cards, a player puts the top three cards of their library into their graveyard.)

(As a Siege enters, choose an opponent to protect it. You and others can attack it. When it's defeated, exile it, then cast it transformed.)

When Invasion of Ergamon enters, create a Treasure token. Then you may discard a card. If you do, draw a card.

(As a Siege enters, choose an opponent to protect it. You and others can attack it. When it's defeated, exile it, then cast it transformed.)

When Invasion of Vryn enters, draw three cards, then discard a card.

Trample, haste

Channel — , Discard Ironhoof Boar: Target creature gets +3/+1 and gains trample until end of turn.

(: Add or .)

Irrigated Farmland enters tapped.

Cycling (, Discard this card: Draw a card.)

: Add or .

: Until end of turn, Izzet Keyrune becomes a 2/1 blue and red Elemental artifact creature.

Whenever Izzet Keyrune deals combat damage to a player, you may draw a card. If you do, discard a card.

+1: Whenever one or more creatures you control deal combat damage to a player this turn, draw a card, then discard a card.

−2: Create a 2/2 blue Illusion creature token with "When this creature becomes the target of a spell, sacrifice it."

−5: Create two tokens that are copies of Jace, Cunning Castaway, except they're not legendary.

, : Each player discards their hand, then draws cards equal to the greatest number of cards a player discarded this way.

Discard a card: Return Jadzi, Oracle of Arcavios to its owner's hand.

Magecraft — Whenever you cast or copy an instant or sorcery spell, reveal the top card of your library. If it's a nonland card, you may cast it by paying rather than paying its mana cost. If it's a land card, put it onto the battlefield.

, : Draw a card, then discard a card.

, , Discard a card: Create a token that's a copy of another target creature you control. It gains haste and "When this creature dies, draw a card." Sacrifice it at the beginning of the next end step. Activate only as a sorcery.

Blitz (If you cast this spell for its blitz cost, it gains haste and "When this creature dies, draw a card." Sacrifice it at the beginning of the next end step.)