Card

Firebending Student

Avatar: the Last Airbender Art Series

Avatar: The Last Airbender Eternal

Instant

If you control a commander, you may cast this spell without paying its mana cost.
Counter target noncreature spell.

Fierce Guardianship

Avatar: The Last Airbender

Creature — Human Monk

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
Firebending X, where X is this creature's power. (Whenever this creature attacks, add X {R}. This mana lasts until end of combat.)

Sibsig Appraiser

Tarkir: Dragonstorm Art Series

Tarkir: Dragonstorm

Creature — Zombie Advisor

When this creature enters, look at the top two cards of your library. Put one of them into your hand and the other into your graveyard.

Modern Horizons 3

Creature — Lizard Wizard

Noncreature spells you cast from exile have convoke. (Each creature you tap while casting a noncreature spell from exile pays for {1} or one mana of that creature's color.)
At the beginning of your first main phase, you may discard a card. If you do, exile the top two cards of your library, then choose one of them. You may play that card this turn.

Party Thrasher

Outlaws of Thunder Junction Tokens

Roxanne, Starfall Savant

Token Artifact

When Meteorite enters the battlefield, it deals 2 damage to any target.
{T}: Add one mana of any color.

Meteorite

Outlaws of Thunder Junction Promos

Legendary Creature — Cat Druid

Whenever Roxanne enters or attacks, create a tapped colorless artifact token named Meteorite with "When this token enters, it deals 2 damage to any target" and "{T}: Add one mana of any color."
Whenever you tap an artifact token for mana, add one mana of any type that artifact token produced.

Deduce

Murders at Karlov Manor Art Series

Murders at Karlov Manor

A Mysterious Creature

Creature — Elf Rogue

Deathtouch
When this creature enters or is turned face up, target creature gains indestructible until end of turn.
Disguise {4}{B/G}{B/G} (You may cast this card face down for {3} as a 2/2 creature with ward {2}. Turn it face up any time for its disguise cost.)

Rakish Scoundrel

Clue

Draw a card. Investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this token: Draw a card.")

March of the Machine: The Aftermath

Creature — Vampire Noble

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.)
Lifelink
Other Vampires you control get +1/+1.
Madness {2}{B} (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)

Markov Baron

Argothian Opportunist

The Brothers' War Art Series

The Brothers' War

Creature — Human Soldier

Roc Hunter

Powerstone

Creature — Human Scout

When this creature enters, create a tapped Powerstone token. (It's an artifact with "{T}: Add {C}. This mana can't be spent to cast a nonartifact spell.")

Secret Lair Drop

Draw a card. You may put a land card from your hand onto the battlefield.