Geist of Saint Thalia

Flying
Noncreature spells you cast cost {1} less to cast.

Hapatra, the Desert Frost

When Hapatra enters, for each opponent, tap up to one target creature that player controls. Put a stun counter on each of those creatures. (If a permanent with a stun counter would become untapped, remove one from it instead.)
{2}{U}: Untap target creature.

Jace

Jace, Reality Sculptor

+1: Empower Jace X, where X is the number of Islands you control.
−3: Until your next turn, whenever a creature attacks you or a planeswalker you control, it gets -5/-0 until end of turn.
0: Exile all but the bottom card of each opponent's library. Activate only if there are twenty-five or more loyalty counters among Jaces you control.

Angel

Lyra, Tolarian Archangel

Flying
At the beginning of each end step, if you've drawn three or more cards this turn, create a 3/3 blue Angel creature token with flying.
{3}{U}{U}: Until end of turn, whenever Lyra deals combat damage to a player, draw two cards.

Proft, Consulting Detective

Whenever you scry or surveil, you may pay {2}. If you do, put a +1/+1 counter on Proft and draw a card. (Draw after you scry or surveil.)

Ruric Thar, Biomagus

Flying
Prowess, prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn twice.)
Whenever Ruric Thar becomes the target of a spell or ability an opponent controls, draw a card.

Surgical Precision

Choose one —
• Destroy target creature with toughness 4 or greater. You gain 1 life.
• You draw a card and gain 2 life.

Samut, Tyrant of Naktamun

Instant and sorcery spells you control have split second. (As long as a spell with split second is on the stack, players can't cast spells or activate abilities that aren't mana abilities.)

Tetsuko Umezawa, Fugitive

Creatures you control with power or toughness 1 or less can't be blocked.

Traxos, Academy Guardian

This spell costs {2} less to cast if you've cast a noncreature spell this turn.
Flying, vigilance
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)

Way of the Cryomancer

When Way of the Cryomancer enters, empower Jace 5. (Put five 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.")
Planeswalkers you control have "[−3]: When you next cast an instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy."

Way of the Mind Sculptor

When Way of the Mind Sculptor enters, empower Jace 5. (Put five 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.")
Whenever you activate a loyalty ability, if you removed two or more loyalty counters to activate it, draw a card.

Yargle, Goliath of Otaria

Yuriko, Hope from the Shadows

Flash
When Yuriko enters, choose one —
• Target creature gets -X/-0 until end of turn, where X is the number of cards in your graveyard.
• 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.)

Danitha, Spear of Agony

First strike
Whenever you cast a spell that targets an opponent or a creature an opponent controls, put a +1/+1 counter on Danitha.

Gallia, Tragic Host

Menace (This creature can't be blocked except by two or more creatures.)
{4}{B}, Exile another creature card from your graveyard: Return this card from your graveyard to the battlefield tapped with a +1/+1 counter on her.

Reality Fracture