Master of Barbs

Menace
Whenever one or more opponents are dealt noncombat damage, creatures you control get +1/+0 until end of turn.

Gardenize

Whenever a creature you control dies, put a charge counter on this enchantment.
At the beginning of your first main phase, add {G} for each charge counter on this enchantment.

Hungering Puppetbeast

Heartwood

When this creature enters, create a Heartwood token. (It's a red and green artifact with "{T}: Add {R} or {G}.")
{1}, Sacrifice another artifact: Put a +1/+1 counter on this creature. It gains your choice of trample, hexproof, or haste until end of turn.

Aerid Konstrari

Flying
When Aerid Konstrari enters or dies, create a Heartwood token. (It's a red and green artifact with "{T}: Add {R} or {G}.")
{6}: Create a Heartwood token. Then Aerid Konstrari gets +X/+0 until end of turn, where X is the number of artifacts you control.

Avatar of Burgeoning Echoes

Jace

Landfall — Whenever a land you control enters, 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.")
Planeswalkers you control have "[−10]: Put a +1/+1 counter on target creature for each land you control."

Denzilore Fatehold

Flash
Flying
Whenever you scry or surveil, put a +1/+1 counter on each creature you control.

Plan for All Outcomes

When this enchantment enters, the owner of up to one other target nonland permanent puts it on their choice of the top or bottom of their library.
Whenever you cast your first noncreature spell each turn, 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.")

Entrust the Spark

You may sacrifice a planeswalker. If you do, search your library for a planeswalker card, put it onto the battlefield, then shuffle.

Cadet

Ingris Stingerquill

Flying
Whenever a creature you control attacks, that creature deals 1 damage to each opponent.
{4}: Create a 2/2 colorless Wizard Soldier creature token named Cadet. Then creatures you control gain haste until end of turn.

Kwia Vigorbloom

Lotus

Flying, vigilance, lifelink, ward {2}
Whenever you gain life, create a colorless artifact token named Lotus with "{T}, Sacrifice this token: Add three mana of any one color." This ability triggers only once each turn.

Null Summoner

When this creature enters, if you cast it, target opponent reveals their hand. You choose a nonland card from it. Exile that card.
Threshold — As long as there are seven or more cards in your graveyard, you may cast the exiled card, and mana of any type can be spent to cast that spell.

Proctor of Potential

Whenever this creature or another creature you control enters, surveil 1. (Look at the top card of your library. You may put it into your graveyard.)
{W}{U}: Return this card from your graveyard to the battlefield with a finality counter on it. Activate only if you've scried or surveilled this turn. (If a creature with a finality counter on it would die, exile it instead.)

Solitary Cell

When this artifact enters, exile target nonland permanent an opponent controls with mana value 3 or less until this artifact leaves the battlefield.
{1}, {T}, Discard a legendary card: Draw a card.

Stinging Vitriol

Stinging Vitriol deals 2 damage to target opponent. That player reveals their hand. You choose a nonland card from it. They discard that card.

Tenured Tethermage

When this creature enters, you may sacrifice a land. If you do, create two tapped Heartwood tokens. (They're red and green artifacts with "{T}: Add {R} or {G}.")
Tap two untapped artifacts you control: Put two +1/+1 counters on this creature.

Uldaros Theorix

Copy

Flying
When Uldaros Theorix enters, if you cast him, exile up to one target nonland card of each card type from your graveyard. Copy those cards. You may cast any number of spells with total mana value 6 or less from among the copies without paying their mana costs. (Permanent spells cast this way become tokens.)

Reality Fracture