Great Hall of the Biblioplex

{T}: Add {C}.
{T}, Pay 1 life: Add one mana of any color. Spend this mana only to cast an instant or sorcery spell.
{5}: If this land isn't a creature, it becomes a 2/4 Wizard creature with "Whenever you cast an instant or sorcery spell, this creature gets +1/+0 until end of turn." It's still a land.

Conciliator's Duelist

When this creature enters, draw a card. Each player loses 1 life.
Repartee — Whenever you cast an instant or sorcery spell that targets a creature, exile up to one target creature. Return that card to the battlefield under its owner's control at the beginning of the next end step.

Heroic Stanza

Abigale, Poet Laureate

Flying
Whenever you cast a creature spell, Abigale becomes prepared. (While it's prepared, you may cast a copy of its spell. Doing so unprepares it.)

Abigale, Poet Laureate // Heroic Stanza

Rejoinder

You may tap or untap target creature.
Draw a card.

Elite Interceptor

This creature enters prepared. (While it's prepared, you may cast a copy of its spell. Doing so unprepares it.)

Elite Interceptor // Rejoinder

Primary Research

When this enchantment enters, return target nonland permanent card with mana value 3 or less from your graveyard to the battlefield.
At the beginning of your end step, if a card left your graveyard this turn, draw a card.

Swamp

Interjection

Target creature gets +2/+2 and gains first strike until end of turn.

Graduation Day

Repartee — Whenever you cast an instant or sorcery spell that targets a creature, put a +1/+1 counter on target creature you control.

Root Manipulation

Until end of turn, creatures you control get +2/+2 and gain menace and "Whenever this creature attacks, you gain 1 life." (A creature with menace can't be blocked except by two or more creatures.)

Lumaret's Favor

Infusion — When you cast this spell, copy it if you gained life this turn. You may choose new targets for the copy.
Target creature gets +2/+4 until end of turn.

Arcane Omens

Converge — Target player discards X cards, where X is the number of colors of mana spent to cast this spell.

Lorehold, the Historian

Flying, haste
Each instant and sorcery card in your hand has miracle {2}. (You may cast a card for its miracle cost when you draw it if it's the first card you drew this turn.)
At the beginning of each opponent's upkeep, you may discard a card. If you do, draw a card.

Have a Bite

Put a +1/+1 counter on target creature. You gain 1 life.

Adventurous Eater

Adventurous Eater // Have a Bite

Silverquill Charm

Choose one —
• Put two +1/+1 counters on target creature.
• Exile target creature with power 2 or less.
• Each opponent loses 3 life and you gain 3 life.

Planar Engineering

Sacrifice two lands. Search your library for four basic land cards, put them onto the battlefield tapped, then shuffle.

Rapturous Moment

Draw three cards, then discard two cards. Add {U}{U}{R}{R}{R}.

Reanimate

Put target creature card from a graveyard onto the battlefield under your control. You lose life equal to that card's mana value.

Grave Researcher

At the beginning of your upkeep, surveil 1. Then if there are three or more creature cards in your graveyard, this creature becomes prepared. (While it's prepared, you may cast a copy of its spell. Doing so unprepares it.)

Grave Researcher // Reanimate

Locust Spray

Target creature gets -1/-1 until end of turn.
Cycling {B} ({B}, Discard this card: Draw a card.)

Inkling Mascot

Repartee — Whenever you cast an instant or sorcery spell that targets a creature, this creature gains flying until end of turn. Surveil 1. (Look at the top card of your library. You may put it into your graveyard.)

Royal Treatment

Target creature you control gains hexproof until end of turn. Create a Royal Role token attached to that creature. (If you control another Role on it, put that one into the graveyard. Enchanted creature gets +1/+1 and has ward {1}.)

Forest

Antiquities on the Loose

Create two 2/2 red and white Spirit creature tokens. Then if this spell was cast from anywhere other than your hand, put a +1/+1 counter on each Spirit you control.
Flashback {4}{W}{W} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Lecturing Scornmage

Repartee — Whenever you cast an instant or sorcery spell that targets a creature, put a +1/+1 counter on this creature.

End of the Hunt

Target opponent exiles a creature or planeswalker they control with the greatest mana value among creatures and planeswalkers they control.

Zaffai and the Tempests

Once during each of your turns, you may cast an instant or sorcery spell from your hand without paying its mana cost.

Pick Your Poison

Choose one —
• Each opponent sacrifices an artifact of their choice.
• Each opponent sacrifices an enchantment of their choice.
• Each opponent sacrifices a creature with flying of their choice.

Lorehold Charm

Choose one —
• Each opponent sacrifices a nontoken artifact of their choice.
• Return target artifact or creature card with mana value 2 or less from your graveyard to the battlefield.
• Creatures you control get +1/+1 and gain trample until end of turn.

Snooping Page

Repartee — Whenever you cast an instant or sorcery spell that targets a creature, this creature can't be blocked this turn.
Whenever this creature deals combat damage to a player, you draw a card and lose 1 life.

Plains

Inkshape Demonstrator

Ward {2} (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays {2}.)
Repartee — Whenever you cast an instant or sorcery spell that targets a creature, this creature gets +1/+0 and gains lifelink until end of turn.

Shattered Acolyte

Lifelink
{1}, Sacrifice this creature: Destroy target artifact or enchantment.

Giant Growth

Target creature gets +3/+3 until end of turn.

Aberrant Manawurm

Trample
Whenever you cast an instant or sorcery spell, this creature gets +X/+0 until end of turn, where X is the amount of mana spent to cast that spell.

Wild Idea

Search your library for an instant or sorcery card, reveal it, put it into your hand, then shuffle.

Sanar, Unfinished Genius

Sanar enters prepared. (While it's prepared, you may cast a copy of its spell. Doing so unprepares it.)
{T}: Create a Treasure token. Activate only if you've cast an instant or sorcery spell this turn.

Sanar, Unfinished Genius // Wild Idea

Soaring Stoneglider

As an additional cost to cast this spell, exile two cards from your graveyard or pay {1}{W}.
Flying, vigilance

Rehearsed Debater

Vigilance
Repartee — Whenever you cast an instant or sorcery spell that targets a creature, this creature gets +1/+1 until end of turn.

Deep Sight

Tam, Observant Sequencer

Landfall — Whenever a land you control enters, Tam becomes prepared. (While it's prepared, you may cast a copy of its spell. Doing so unprepares it.)

Tam, Observant Sequencer // Deep Sight

Stress Dream

Stress Dream deals 5 damage to up to one target creature. Look at the top two cards of your library. Put one of those cards into your hand and the other on the bottom of your library.

Strixhaven Skycoach

Flying
When this Vehicle enters, you may search your library for a basic land card, reveal it, put it into your hand, then shuffle.
Crew 2 (Tap any number of creatures you control with total power 2 or more: This Vehicle becomes an artifact creature until end of turn.)

Render Speechless

Target opponent reveals their hand. You choose a nonland card from it. That player discards that card.
Put two +1/+1 counters on up to one target creature.