Resonating Array
Artifact - Powerstone (U)
: Add . This mana can’t be spent to cast a nonartifact spell.
Tap two untapped Powerstones you control: Add . This mana can’t be spent to cast a nonartifact spell.

Eternity Negator
Creature — Eldrazi Horror (R)
Annihilator 1
Whenever Eternity Negator is dealt damage, you sacrifice that many permanents. For each land sacrificed this way, create a Waste land with ": Add ." For each nonland permanent sacrificed this way, create a 1/1 colorless Eldrazi Scion creature token. It has “Sacrifice this creature: Add ."
5/5

Sword of King and Country
Artifact ─ Equipment (M)
Equipped creature gets +2/+2 and has protection from colorless and multicolored.
Whenever equipped creature deals combat damage to a player, search your library for a creature card with no abilities and put it onto the battlefield. Then shuffle.
Equip
"Stand for the common man and he will fall for you." ─ inscription

Plundered Tomb
Land (C)
Plundered Tomb enters tapped. When it enters, you may discard a card. If you do, draw a card.
: Add .
Quintorius's expertise is not just knowing how to find things but which things to find.

Plumbers Tomb
Land (U)
: Add .
Descend 4 ─ : add or .
Descend 8 ─ : add , or .
Quintorius's expertise was knowing what he was going to find and questioning his life choices.

Copperline Forge
Land (R)
~ enters the battlefield tapped unless you pay .
: Add or .
The greatest evolution is the one that no longer needs to happen.

Sunken Library
Land (M)
: Add .
, put target land you own on the bottom of your library: Draw a card.
Each legend they pursued in vain proved a compass to discovery.

Broomsweep Charm
Instant (C)
Choose one—

• Tap up to one target creature. Untap up to one target Merfolk.
• Target creature gets +1/+1 until end of turn. If it's a Soldier, it gains lifelink until end of turn.
• Destroy up to one target Aura or Equipment. You may return a Kithkin card from your graveyard to your hand.

Sweep from east to west to banish worries to a night that will never come.

Ambush Sentinels
Sorcery (U)
Flash, Vigilance
[2/4]

Sandstorm Staver
Creature — Human Advisor (R)
When Sandstorm Staver enters the battlefield, exile all nonland permanents. Each of those cards becomes plotted (by its owner).
Players can't cast more than one spell from exile each turn.
"Rushin' ain't no way to survive in this sun."
1/1

The Wanderer, Home
Legendary Creature — Human Noble (M)
Flash
Vigilance, first strike
You may have The Wanderer, Home enter tapped. When you do, it deals 2 damage to up to one target attacking or blocking creature.
, Discard a card: Exile The Wanderer, Home, then return it to the battlefield.
"Perhaps I never had an appetite for governance."
2/2

Thorough Review
Sorcery (C)
Draw a card.
Rebound (If you cast this spell from your hand, exile it as it resolves. At the beginning of your next upkeep, you may cast this card from exile without paying its mana cost.)
Chronomancy is strictly off limits at Strixhaven — except come grading time.

I wonder if this is okay?

Put on your Thinking Caps
Enchantment (U)
You may activate abilities of creatures you control as though those creatures had haste.
The activated abilities of creatures you control cost you less to activate.
Strixhaven; where you will learn the power of privilege, politics and what potions help you pull all-nighters.

Evacuation Protocol
Sorcery
Return each nonland permanent with converted mana cost X or less to its owner's hand.
"Elderly and children first."

Elder Quartermaster

Creature - Human Pirate (MR)
When ~ enters the battlefield, create a Treasure token. Then mill cards equal to the number of Treasure tokens you control.
Each instant and sorcery card in your graveyard has flashback. The flashback cost is equal to that card’s mana cost.
Ancient treasure begets ancient knowledge.
3/2

I think it'd depend on the format but it'd be above-rate usually. Mentor's Guidance.

Terrorize the Town
Sorcery (C)
Spree
+ — Target player discards a card.
+ — Target player discards a card.
+ — Target player reveals a card from their hand. You choose a nonland card from it and that player discards it.

Cold Revenge
Sorcery (U)
Return target creature card from your graveyard to the battlefield. It fights target creature.

Darken the Door
Sorcery
Spree
+ — Target player mills five cards, then return a creature card from that player's graveyard to the battlefield under your control. You lose life equal to that creature's mana value.
+ — Destroy target enchantment. You lose life equal to its mana value.
+ — Each opponent loses life equal to the amount of life you lost this turn.
Without a word, the peace was irrevocably disturbed.

Dauntless Desperado
Creature ─ Human Mercenary (M)
This spell costs less to cast for each opponent you have.
Imprint ─ When Dauntless Desperado enters the battlefield, exile a creature card from your hand. While this card is in exile, Dauntless Desperado gets +2/+2.
Deathtouch, myriad
2/2
A match flared in the corner of the saloon. They all died before the flame.

Shock Sensibilities
Sorcery (C)
Shock Sensibilities deals X damage to target creature, where X is the number of crimes you committed this turn (including targeting with this spell).