Caustic Exhale

As an additional cost to cast this spell, behold a Dragon or pay {1}. (To behold a Dragon, choose a Dragon you control or reveal a Dragon card from your hand.)
Target creature gets -3/-3 until end of turn.

Of One Mind

This spell costs {2} less to cast if you control a Human creature and a non-Human creature.
Draw two cards.

Getting

Etherium Sculptor

Artifact spells you cast cost {1} less to cast.

Counterspell

Mana Leak

Counter target spell unless its controller pays {3}.

Dry Spell

Dry Spell deals 1 damage to each creature and each player.

Jailbreak Scheme

Spree (Choose one or more additional costs.)
+ {3} — Put a +1/+1 counter on target creature. It can't be blocked this turn.
+ {2} — Target artifact or creature's owner puts it on their choice of the top or bottom of their library.

Tormod's Cryptkeeper

Vigilance
{T}, Sacrifice this creature: Exile target player's graveyard.

Have

Mistvault Bridge

This land enters tapped.
Indestructible
{T}: Add {U} or {B}.

Lunatic Pandora

{2}, {T}: Surveil 1. (Look at the top card of your library. You may put it into your graveyard.)
{6}, {T}, Sacrifice Lunatic Pandora: Destroy target nonland permanent.

Clear the Mind

Target player shuffles their graveyard into their library.
Draw a card.

Three Tree Mascot

Changeling (This card is every creature type.)
{1}: Add one mana of any color. Activate only once each turn.

Gift of Fangs

Enchant creature
Enchanted creature gets +2/+2 as long as it's a Vampire. Otherwise, it gets -2/-2.

Spell Pierce

Counter target noncreature spell unless its controller pays {2}.

Barkform Harvester

Changeling (This card is every creature type.)
Reach
{2}: Put target card from your graveyard on the bottom of your library.

Scroll of Griselbrand

{1}, Sacrifice this artifact: Target opponent discards a card. If you control a Demon, that player loses 3 life.

Thoughtcast

Affinity for artifacts (This spell costs {1} less to cast for each artifact you control.)
Draw two cards.

Firdoch Core

Changeling (This card is every creature type.)
{T}: Add one mana of any color.
{4}: This artifact becomes a 4/4 artifact creature until end of turn.

Embermouth Sentinel

When this creature enters, you may search your library for a basic land card, reveal it, then shuffle and put that card on top. If you control a Dragon, put that card onto the battlefield tapped instead.

Sulfur Vent

This land enters tapped.
{T}: Add {B}.
{T}, Sacrifice this land: Add {U}{R}.

Refurbished Familiar

Affinity for artifacts (This spell costs {1} less to cast for each artifact you control.)
Flying
When this creature enters, each opponent discards a card. For each opponent who can't, you draw a card.

Swamp

Foundry Inspector

Iron Giant

Island

Scroll of Avacyn

{1}, Sacrifice this artifact: Draw a card. If you control an Angel, you gain 5 life.

Mirrorshell Crab

Ward {3} (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays {3}.)
Channel — {2}{U}, Discard this card: Counter target spell or ability unless its controller pays {3}.