Discard

Discard is a mechanic which takes cards from a player's hand and puts them in their library. Discard is in the black part of the color pie. Discard spells are more often at sorcery speed, a few have been printed at instant speed. The creature type Spectres are famous for causing players to discard cards when they are unblocked.

From the ()

List of discard spells

Instants

One card

• Funeral Charm — their choice

Two cards

• Haunting Hymn — their choice - If played during your main phase, then they discard four cards.

Sorceries

One card

• Blackmail — they reveal three cards, you choose one and that card is discarded.
• Brain Pry — name a nonland card, if its in that player's hand they discard a card with that name. If they can't, you draw a card.
• Coercion — your choice
• Cry of Contrition — their choice - Cry of Contrition has haunt, when the creature it haunts is put into a graveyard, target player discards a card.
• Distress — nonland card of your choice
• Duress — nonland-noncreature card of their choice
• Encroach — nonbasic land of your choice
• Flay — randomly - unless they pay , they discard another card randomly
• Hypnotic Cloud — their choice - If kicker cost of is paid then they discard three cards instead.
• Mind Knives — randomly
• Mind Peel — their choice - Buyback
• Mind Ravel — their choice - Cantrip
• Nightmare Void — your choice - Dredge 2

Two cards

• Bog Down — their choice - If kicker cost of sacrificing a land is paid then they discard three cards instead.
• Chain of Smog — their choice - that player may copy this spell and may choose a new target for that copy.
• Extortion — your choice
• Fill with Fright — their choice - Scry 2
• Hymn to Tourach — randomly
• Mind Rot — their choice

Three cards

• Delirium Skeins — each player
• Fugure — their choice
• Mindstab — their choice - Suspend 4 -

Variable cards

• Cabal Therapy — name a nonland card, target player discards all cards with that name. Also has flashback (sacrifice a creature).
• Cabal Conditioning — any number of players each discards cards from their hand equal to the highest converted mana cost among permanents you control.
• Death Cloud — each player loses X life, discards X cards, sacrifices X creatures and X lands.
• Hint of Insanity — all nonland cards with the same name as another card in their hand
• Ill-Gotten Gains — each player discards their hand then puts up to three cards from their graveyard into their hand.
• Last Rites — you discard any number of cards from your hand, then you choose a nonland card for each card to discard of target player
• Mind Burst — their choice of X cards where X is one plus the number of Mind Burst cards in all graveyards.
• Mind Extraction — you sacrifice a creature, target player reveals their hand and discards all cards of each of the sacrificed creatures colors
• Mind Sludge — target player discards a card from their hand for each swamp you control.
• Mind Twist — randomly discard X cards
• Mind Warp — your choice of X cards

In the above list; "their choice" means the target player gets to choose which cards to discard, "your choice" means the person casting the spell gets to choose.