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.)
{2}
Arcane Signet
Artifact
{T}: Add one mana of any color in your commander's color identity.
{U}{B}
Baleful Strix
Artifact Creature - Bird
Flying, deathtouch
When Baleful Strix enters, draw a card.
1 /
1
{2}
Charcoal Diamond
Artifact
Charcoal Diamond enters tapped.
{T}: Add {B}.
{6}{U}{U}
Dig Through Time
Instant
Delve (Each card you exile from your graveyard while casting this spell pays for {1}.)
Look at the top seven cards of your library. Put two of them into your hand and the rest on the bottom of your library in any order.
{2}
Dimir Signet
Artifact
{1}, {T}: Add {U}{B}.
{X}{U}
Epiphany at the Drownyard
Instant
Reveal the top X plus one cards of your library and separate them into two piles. An opponent chooses one of those piles. Put that pile into your hand and the other into your graveyard.
{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.
{2}
Fellwar Stone
Artifact
{T}: Add one mana of any color that a land an opponent controls could produce.
{3}{U}
Fortune's Favor
Instant
Target opponent looks at the top four cards of your library and separates them into a face-down pile and a face-up pile. Put one pile into your hand and the other into your graveyard.
{2}{U}
Manifold Insights
Sorcery
Reveal the top ten cards of your library. Starting with the next opponent in turn order, each opponent chooses a different nonland card from among them. Put the chosen cards into your hand and the rest on the bottom of your library in a random order.
{2}
Mind Stone
Artifact
{T}: Add {C}.
{1}, {T}, Sacrifice Mind Stone: Draw a card.
{4}{U}
Mulldrifter
Creature - Elemental
Flying
When Mulldrifter enters the battlefield, draw two cards.
Evoke {2}{U} (You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters the battlefield.)
2 /
2
{1}{U}{B}
Notion Rain
Sorcery
Surveil 2, then draw two cards. Notion Rain deals 2 damage to you. (To surveil 2, look at the top two cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.)
{4}{U}{B}
Sire of Stagnation
Creature - Eldrazi
Devoid (This card has no color.)
Whenever a land enters the battlefield under an opponent's control, that player exiles the top two cards of their library and you draw two cards.
5 /
7
{2}
Sky Diamond
Artifact
Sky Diamond enters the battlefield tapped.
{T}: Add {U}.
{1}
Sol Ring
Artifact
{T}: Add {C}{C}.
{4}
Solemn Simulacrum
Artifact Creature - Golem
When Solemn Simulacrum enters, you may search your library for a basic land card, put that card onto the battlefield tapped, then shuffle.
When Solemn Simulacrum dies, you may draw a card.
2 /
2
{5}{U}{U}
Sphinx of Uthuun
Creature - Sphinx
Flying
When Sphinx of Uthuun enters the battlefield, 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.
5 /
6
{2}
Star Compass
Artifact
Star Compass enters tapped.
{T}: Add one mana of any color that a basic land you control could produce.
{2}
Talisman of Dominance
Artifact
{T}: Add {C}.
{T}: Add {U} or {B}. Talisman of Dominance deals 1 damage to you.
{2}
Thought Vessel
Artifact
You have no maximum hand size.
{T}: Add {C}.
{7}{U}
Treasure Cruise
Sorcery
Delve (Each card you exile from your graveyard while casting this spell pays for {1}.)
Draw three cards.
{1}{U}
Truth or Tale
Instant
Reveal the top five cards of your library and separate them into two piles. An opponent chooses one of those piles. Put a card from the chosen pile into your hand, then put all other cards revealed this way on the bottom of your library in any order.
{1}
Wayfarer's Bauble
Artifact
{2}, {T}, Sacrifice Wayfarer's Bauble: Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle.
{2}{U}{B}
Whispering Madness
Sorcery
Each player discards their hand, then draws cards equal to the greatest number of cards a player discarded this way.
Cipher (Then you may exile this spell card encoded on a creature you control. Whenever that creature deals combat damage to a player, its controller may cast a copy of the encoded card without paying its mana cost.)
{2}{U}
Windfall
Sorcery
Each player discards their hand, then draws cards equal to the greatest number of cards a player discarded this way.