Draw cards equal to the number of cards in your hand, then discard a card for each card drawn this way.
Basic landcycling {2} ({2}, Discard this card: Search your library for a basic land card, reveal it, put it into your hand, then shuffle.)
{B}
Appetite for Brains
Sorcery
Target opponent reveals their hand. You choose a card from it with mana value 4 or greater and exile that card.
{1}{U}
Arcane Denial
Instant
Counter target spell. Its controller may draw up to two cards at the beginning of the next turn's upkeep.
You draw a card at the beginning of the next turn's upkeep.
{3}{U}{U}
Baral's Expertise
Sorcery
Return up to three target artifacts and/or creatures to their owners' hands.
You may cast a spell with mana value 4 or less from your hand without paying its mana cost.
{6}{U}{U}
Beacon of Tomorrows
Sorcery
Target player takes an extra turn after this one. Shuffle Beacon of Tomorrows into its owner's library.
{3}{B}{B}
Beacon of Unrest
Sorcery
Put target artifact or creature card from a graveyard onto the battlefield under your control. Shuffle Beacon of Unrest into its owner's library.
--
Bojuka Bog
Land
Bojuka Bog enters the battlefield tapped.
When Bojuka Bog enters the battlefield, exile target player's graveyard.
{T}: Add {B}.
{2}{U}{B}
Brainbite
Sorcery
Target opponent reveals their hand. You choose a card from it. That player discards that card.
Draw a card.
{U}
Brainstorm
Instant
Draw three cards, then put two cards from your hand on top of your library in any order.
{B}
Cabal Therapy
Sorcery
Choose a nonland card name. Target player reveals their hand and discards all cards with that name.
Flashback--Sacrifice a creature. (You may cast this card from your graveyard for its flashback cost. Then exile it.)
{1}{U}{U}
Capsize
Instant
Buyback {3} (You may pay an additional {3} as you cast this spell. If you do, put this card into your hand as it resolves.)
Return target permanent to its owner's hand.
--
Cascade Bluffs
Land
{T}: Add {C}.
{U/R}, {T}: Add {U}{U}, {U}{R}, or {R}{R}.
{1}{R}
Cathartic Reunion
Sorcery
As an additional cost to cast this spell, discard two cards.
Draw three cards.
{2}{R}
Chaos Warp
Instant
The owner of target permanent shuffles it into their library, then reveals the top card of their library. If it's a permanent card, they put it onto the battlefield.
--
Choked Estuary
Land
As Choked Estuary enters the battlefield, you may reveal an Island or Swamp card from your hand. If you don't, Choked Estuary enters the battlefield tapped.
{T}: Add {U} or {B}.
{U}
Clairvoyance
Instant
Look at target player's hand.
Draw a card at the beginning of the next turn's upkeep.
--
Command Tower
Land
{T}: Add one mana of any color in your commander's color identity.
{B}
Cremate
Instant
Exile target card from a graveyard.
Draw a card.
{1}{U}
Cyclonic Rift
Instant
Return target nonland permanent you don't control to its owner's hand.
Overload {6}{U} (You may cast this spell for its overload cost. If you do, change "target" in its text to "each.")
{U}{B}
Dimir Charm
Instant
Choose one --
• Counter target sorcery spell.
• Destroy target creature with power 2 or less.
• Look at the top three cards of target player's library. Put one back and the rest into that player's graveyard.
{B}
Divest
Sorcery
Target player reveals their hand. You choose an artifact or creature card from it. That player discards that card.
{3}{U}{U}
Docent of Perfection
Creature - Insect Horror
Flying
Whenever you cast an instant or sorcery spell, create a 1/1 blue Human Wizard creature token. Then if you control three or more Wizards, transform Docent of Perfection.
5 /
4
--
Final Iteration
Creature - Eldrazi Insect
Flying
Wizards you control get +2/+1 and have flying.
Whenever you cast an instant or sorcery spell, create a 1/1 blue Human Wizard creature token.
5 /
4
{2}{B}
Doomfall
Sorcery
Choose one --
• Target opponent exiles a creature they control.
• Target opponent reveals their hand. You choose a nonland card from it. Exile that card.
--
Dragonskull Summit
Land
Dragonskull Summit enters the battlefield tapped unless you control a Swamp or a Mountain.
{T}: Add {B} or {R}.
--
Drowned Catacomb
Land
Drowned Catacomb enters the battlefield tapped unless you control an Island or a Swamp.
{T}: Add {U} or {B}.
{B}
Duress
Sorcery
Target opponent reveals their hand. You choose a noncreature, nonland card from it. That player discards that card.
--
Evolving Wilds
Land
{T}, Sacrifice Evolving Wilds: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.
{3}{U}
Fact or Fiction
Instant
Reveal the top five cards of your library. An opponent separates those cards into two piles. Put one pile into your hand and the other into your graveyard.
{R}
Faithless Looting
Sorcery
Draw two cards, then discard two cards.
Flashback {2}{R} (You may cast this card from your graveyard for its flashback cost. Then exile it.)
--
Foreboding Ruins
Land
As Foreboding Ruins enters the battlefield, you may reveal a Swamp or Mountain card from your hand. If you don't, Foreboding Ruins enters the battlefield tapped.
{T}: Add {B} or {R}.
{2}{U}
Frantic Search
Instant
Draw two cards, then discard two cards. Untap up to three lands.
{U/P}
Gitaxian Probe
Sorcery
({U/P} can be paid with either {U} or 2 life.)
Look at target player's hand.
Draw a card.
--
Graven Cairns
Land
{T}: Add {C}.
{B/R}, {T}: Add {B}{B}, {B}{R}, or {R}{R}.
{2}{R}
Guttersnipe
Creature - Goblin Shaman
Whenever you cast an instant or sorcery spell, Guttersnipe deals 2 damage to each opponent.
2 /
2
{B}
Harsh Scrutiny
Sorcery
Target opponent reveals their hand. You choose a creature card from it. That player discards that card. Scry 1.
{4}
Helm of the Host
Legendary Artifact - Equipment
At the beginning of combat on your turn, create a token that's a copy of equipped creature, except the token isn't legendary. That token gains haste.
Equip {5}
{B}{B}
Hymn to Tourach
Sorcery
Target player discards two cards at random.
{R}{R}
Increasing Vengeance
Instant
Copy target instant or sorcery spell you control. If this spell was cast from a graveyard, copy that spell twice instead. You may choose new targets for the copies.
Flashback {3}{R}{R} (You may cast this card from your graveyard for its flashback cost. Then exile it.)
{B}
Inquisition of Kozilek
Sorcery
Target player reveals their hand. You choose a nonland card from it with mana value 3 or less. That player discards that card.
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
{1}{U}{R}
Jori En, Ruin Diver
Legendary Creature - Merfolk Wizard
Whenever you cast your second spell each turn, draw a card.
2 /
3
--
Luxury Suite
Land
Luxury Suite enters the battlefield tapped unless you have two or more opponents.
{T}: Add {B} or {R}.
{U}
Mental Note
Instant
Mill two cards.
Draw a card.
--
Morphic Pool
Land
Morphic Pool enters the battlefield tapped unless you have two or more opponents.
{T}: Add {U} or {B}.
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
--
Mountain
Basic Land - Mountain
({T}: Add {R}.)
{1}{U}
Negate
Instant
Counter target noncreature spell.
{U}
Opt
Instant
Scry 1.
Draw a card.
{U}
Peek
Instant
Look at target player's hand.
Draw a card.
{U}
Ponder
Sorcery
Look at the top three cards of your library, then put them back in any order. You may shuffle.
Draw a card.
{U}
Pongify
Instant
Destroy target creature. It can't be regenerated. Its controller creates a 3/3 green Ape creature token.
{U}
Portent
Sorcery
Look at the top three cards of target player's library, then put them back in any order. You may have that player shuffle.
Draw a card at the beginning of the next turn's upkeep.
{U}
Preordain
Sorcery
Scry 2, then draw a card. (To scry 2, look at the top two cards of your library, then put any number of them on the bottom and the rest on top in any order.)
{4}
Primal Amulet
Artifact
Instant and sorcery spells you cast cost {1} less to cast.
Whenever you cast an instant or sorcery spell, put a charge counter on Primal Amulet. Then if there are four or more charge counters on it, you may remove those counters and transform it.
--
Primal Wellspring
Land
(Transforms from Primal Amulet.)
{T}: Add one mana of any color. When that mana is spent to cast an instant or sorcery spell, copy that spell and you may choose new targets for the copy.
{3}{U}{B}
Psychic Intrusion
Sorcery
Target opponent reveals their hand. You choose a nonland card from that player's graveyard or hand and exile it. You may cast that card for as long as it remains exiled, and you may spend mana as though it were mana of any color to cast that spell.
{B}{R}
Rakdos Charm
Instant
Choose one --
• Exile target player's graveyard.
• Destroy target artifact.
• Each creature deals 1 damage to its controller.
{3}{B}{B}
Razaketh's Rite
Sorcery
Search your library for a card, put that card into your hand, then shuffle.
Cycling {B} ({B}, Discard this card: Draw a card.)
--
River of Tears
Land
{T}: Add {U}. If you played a land this turn, add {B} instead.
{U}
Serum Visions
Sorcery
Draw a card. Scry 2.
{U}
Sleight of Hand
Sorcery
Look at the top two cards of your library. Put one of them into your hand and the other on the bottom of your library.
{U}
Sorcerous Sight
Sorcery
Look at target opponent's hand.
Draw a card.
{2}
Sorcerous Spyglass
Artifact
As Sorcerous Spyglass enters the battlefield, look at an opponent's hand, then choose any card name.
Activated abilities of sources with the chosen name can't be activated unless they're mana abilities.
{U}
Spy Network
Instant
Look at target player's hand, the top card of that player's library, and any face-down creatures they control. Look at the top four cards of your library, then put them back in any order.
{1}{U}
Strategic Planning
Sorcery
Look at the top three cards of your library. Put one of them into your hand and the rest into your graveyard.
--
Sulfur Falls
Land
Sulfur Falls enters the battlefield tapped unless you control an Island or a Mountain.
{T}: Add {U} or {R}.
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
--
Swamp
Basic Land - Swamp
({T}: Add {B}.)
{U}
Swan Song
Instant
Counter target enchantment, instant, or sorcery spell. Its controller creates a 2/2 blue Bird creature token with flying.
{1}{R}{R}
Sweltering Suns
Sorcery
Sweltering Suns deals 3 damage to each creature.
Cycling {3} ({3}, Discard this card: Draw a card.)
--
Temple of Deceit
Land
Temple of Deceit enters the battlefield tapped.
When Temple of Deceit enters the battlefield, scry 1.
{T}: Add {U} or {B}.
--
Temple of Epiphany
Land
Temple of Epiphany enters the battlefield tapped.
When Temple of Epiphany enters the battlefield, scry 1.
{T}: Add {U} or {R}.
--
Temple of Malice
Land
Temple of Malice enters the battlefield tapped.
When Temple of Malice enters the battlefield, scry 1.
{T}: Add {B} or {R}.
{B}{R}
Terminate
Instant
Destroy target creature. It can't be regenerated.
--
Terramorphic Expanse
Land
{T}, Sacrifice Terramorphic Expanse: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.
{U}
Thought Scour
Instant
Target player mills two cards.
Draw a card.
{B}
Thoughtseize
Sorcery
Target player reveals their hand. You choose a nonland card from it. That player discards that card. You lose 2 life.
{1}{R}
Tormenting Voice
Sorcery
As an additional cost to cast this spell, discard a card.
Draw two cards.
{R}
Vandalblast
Sorcery
Destroy target artifact you don't control.
Overload {4}{R} (You may cast this spell for its overload cost. If you do, change "target" in its text to "each.")
{3}{R}
Violent Impact
Sorcery
Destroy target artifact or land.
Cycling {2} ({2}, Discard this card: Draw a card.)
{R}{R}
Wild Guess
Sorcery
As an additional cost to cast this spell, discard a card.
Draw two cards.
{2}{B}{B}
Yahenni's Expertise
Sorcery
All creatures get -3/-3 until end of turn.
You may cast a spell with mana value 3 or less from your hand without paying its mana cost.
{1}{R}
Young Pyromancer
Creature - Human Shaman
Whenever you cast an instant or sorcery spell, create a 1/1 red Elemental creature token.
2 /
1
{1}{U}{B}{R}
Kess, Dissident Mage
Legendary Creature - Human Wizard
Flying
Once during each of your turns, you may cast an instant or sorcery spell from your graveyard. If a spell cast this way would be put into your graveyard, exile it instead.