Discard outlets
Turning cards in hand into something better — the enablers every reanimator and madness deck needs.
Edit it and search again — it reads plain English, so cards that let me discard cards for value under 3 mana works too.

Archfiend of Ifnir Creature — DemonFlying Whenever you cycle or discard another card, put a -1/-1 counter on each creature your opponents control. Cycling {2} ({2}, $0.36

Brass's Tunnel-Grinder // Tecutlan, the Searing Rift Legendary Artifact // Legendary Land — CaveBrass's Tunnel-Grinder: When Brass's Tunnel-Grinder enters, discard any number of cards, then draw that many cards plus one. At th$3.39

Chainer, Nightmare Adept Legendary Creature — Human MinionDiscard a card: You may cast a creature spell from your graveyard this turn. Activate only once each turn. Whenever a nontoken cre$0.89

Fable of the Mirror-Breaker // Reflection of Kiki-Jiki Enchantment — Saga // Enchantment Creature — Goblin ShamanFable of the Mirror-Breaker: (As this Saga enters and after your draw step, add a lore counter.) I — Create a 2/2 red Goblin Shama$6.37

Jaxis, the Troublemaker Legendary Creature — Human Warrior{R}, {T}, Discard a card: Create a token that's a copy of another target creature you control. It gains haste and "When this token$2.34

Hazoret's Monument Legendary ArtifactRed creature spells you cast cost {1} less to cast. Whenever you cast a creature spell, you may discard a card. If you do, draw a $2.16

Cryptbreaker Creature — Zombie{1}{B}, {T}, Discard a card: Create a 2/2 black Zombie creature token. Tap three untapped Zombies you control: You draw a card and$1.43

Glint-Horn Buccaneer Creature — Minotaur PirateHaste Whenever you discard a card, this creature deals 1 damage to each opponent. {1}{R}, Discard a card: Draw a card. Activate on$10.19

Bone Miser Creature — Zombie WizardWhenever you discard a creature card, create a 2/2 black Zombie creature token. Whenever you discard a land card, add {B}{B}. When$30.53

Surly Badgersaur Creature — Badger DinosaurWhenever you discard a creature card, put a +1/+1 counter on this creature. Whenever you discard a land card, create a Treasure to$18.36

Tolaria West LandThis land enters tapped. {T}: Add {U}. Transmute {1}{U}{U} ({1}{U}{U}, Discard this card: Search your library for a card with mana$1.83

Charming Scoundrel Creature — Human RogueHaste When this creature enters, choose one — • Discard a card, then draw a card. • Create a Treasure token. • Create a Wicked Rol$1.30

Neheb, Dreadhorde Champion Legendary Creature — Zombie Minotaur WarriorTrample Whenever Neheb deals combat damage to a player or planeswalker, you may discard any number of cards. If you do, draw that $0.50

Witch's Mark SorceryYou may discard a card. If you do, draw two cards. Create a Wicked Role token attached to up to one target creature you control. ($0.31

The Restoration of Eiganjo // Architect of Restoration Enchantment — Saga // Enchantment Creature — Fox MonkThe Restoration of Eiganjo: (As this Saga enters and after your draw step, add a lore counter.) I — Search your library for a basi$0.50

Conspiracy Theorist Creature — Human ShamanWhenever this creature attacks, you may pay {1} and discard a card. If you do, draw a card. Whenever you discard one or more nonla$0.31

Cryptcaller Chariot Artifact — VehicleMenace Whenever you discard one or more cards, create that many tapped 2/2 black Zombie creature tokens. Crew 2$0.45

Brallin, Skyshark Rider Legendary Creature — Human ShamanPartner with Shabraz, the Skyshark (When this creature enters, target player may put Shabraz into their hand from their library, t$9.24

Marauding Mako Creature — Shark PirateWhenever you discard one or more cards, put that many +1/+1 counters on this creature. Cycling {2} ({2}, Discard this card: Draw a$0.67

Restless Vents LandThis land enters tapped. {T}: Add {B} or {R}. {1}{B}{R}: Until end of turn, this land becomes a 2/3 black and red Insect creature $0.34

Dimir Infiltrator Creature — SpiritThis creature can't be blocked. Transmute {1}{U}{B} ({1}{U}{B}, Discard this card: Search your library for a card with the same ma$0.60

Moria Scavenger Creature — Orc RogueDeathtouch, haste {T}, Discard a card: Draw a card. If the discarded card was a creature card, amass Orcs 1. (Put a +1/+1 counter $0.38

Ashling, Rekindled // Ashling, Rimebound Legendary Creature — Elemental Sorcerer // Legendary Creature — Elemental WizardAshling, Rekindled: Whenever this creature enters or transforms into Ashling, Rekindled, you may discard a card. If you do, draw a$0.68

Summon: Kujata Enchantment Creature — Saga Ox(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.) I — Lightning — This creature deals 3 dam$0.28

Lord Windgrace Legendary Planeswalker — Windgrace+2: Discard a card, then draw a card. If a land card is discarded this way, draw an additional card. −3: Return up to two target l

Chandra, Spark Hunter Legendary Planeswalker — ChandraAt the beginning of combat on your turn, choose up to one target Vehicle you control. Until end of turn, it becomes an artifact cr$2.69

Stormshriek Feral // Flush Out Creature — Dragon // Sorcery — OmenStormshriek Feral: Flying, haste {1}{R}: This creature gets +1/+0 until end of turn. // Flush Out: Discard a card. If you do, draw$0.21

Summon: G.F. Ifrit Enchantment Creature — Saga Demon(As this Saga enters and after your draw step, add a lore counter. Sacrifice after IV.) I, II — You may discard a card. If you do,$0.15

Change of Plans InstantEach of X target creatures you control connive. You may have any number of them phase out. (To have a creature connive, draw a car$14.67

Scrounging Skyray Creature — Fish PirateFlying Whenever you discard one or more cards, put that many +1/+1 counters on this creature. Cycling {2} ({2}, Discard this card:$0.33
Prices and legality come from Scryfall. Every card here was scored by the same search that runs when you type a question.
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