Jace

Overwrite the Multiverse

Exile all creatures. Empower Jace X, where X is the number of creatures exiled this way. (Put that many loyalty counters on a Jace token you control. If you don't control one, first create a blue Jace planeswalker token with "[−1]: Surveil 1" and "[−3]: Draw a card.")

Fateshaper Aspirant

When this creature enters, choose one —
• Return target legendary card from your graveyard to your hand.
• Put a +1/+1 counter on target creature. It gains vigilance and indestructible until end of turn. (Damage and effects that say "destroy" don't destroy it.)

Rampart Hunter

Deathtouch
When this creature enters, target creature gets +2/+2 and gains deathtouch until end of turn.

Rank Rat

When this creature enters, each opponent discards a card.

Rewrite Regrets

Return target creature or planeswalker card with mana value 6 or less from your graveyard to the battlefield.
Empower Jace 2. (Put two loyalty counters on a Jace token you control. If you don't control one, first create a blue Jace planeswalker token with "[−1]: Surveil 1" and "[−3]: Draw a card.")

Rise of the Deathbringer

Choose one —
• Draw cards equal to the greatest power among creatures you control. You lose life equal to the number of cards drawn this way.
• All creatures get -3/-3 until end of turn.

Sanctum Lurker

When this creature enters, empower Jace 1.
Planeswalkers you control aren't put into their owners' graveyards for having 0 loyalty.
Planeswalkers you control have "[+2]: This planeswalker deals 1 damage to each opponent and you gain 1 life."

Screeching Soulbreaker

Flying
Whenever this creature attacks, it deals 1 damage to each opponent and you gain 1 life.

Silence the Echo

As an additional cost to cast this spell, sacrifice a creature or planeswalker or pay {3}.
Destroy target creature or planeswalker.

Solve for Disappointment

Target opponent reveals their hand. You choose a nonland permanent card from it. That player discards that card.
Empower Jace 1. (Put a loyalty counter on a Jace token you control. If you don't control one, first create a blue Jace planeswalker token with "[−1]: Surveil 1" and "[−3]: Draw a card.")

Terminal Criticism

Destroy target creature or planeswalker that's blue or red. You gain 1 life.

Theoretical Necromancer

{3}{B}, Exile this card from your graveyard: Return another target creature card from your graveyard to your hand.

Flickering Hound

Whenever you cast a creature spell, exile up to one other target creature you control, then return that card to the battlefield under its owner's control.

Void Extrapolator

This creature enters prepared. (While it's prepared, you may cast a copy of its spell. Doing so unprepares it.)
Threshold — This creature gets +1/+1 as long as there are seven or more cards in your graveyard.

Omit Variables

Mill three cards. (Put the top three cards of your library into your graveyard.)

Void Extrapolator // Omit Variables

Vraska's Final Mercy

Choose one —
• You lose 2 life. Destroy target creature or planeswalker.
• You lose 2 life. Empower Jace 6. (Put six loyalty counters on a Jace token you control. If you don't control one, first create a blue Jace planeswalker token with "[−1]: Surveil 1" and "[−3]: Draw a card.")

Ajani's Anguish

When this enchantment enters, it deals X damage to any target.
Creatures you control have trample.

Reality Fracture