Soulbright Seeker

As an additional cost to cast this spell, behold an Elemental or pay {2}. (To behold an Elemental, choose an Elemental you control or reveal an Elemental card from your hand.)
{R}: Target creature you control gains trample until end of turn. If this is the third time this ability has resolved this turn, add {R}{R}{R}{R}.

Twinflame Travelers

Flying
If a triggered ability of another Elemental you control triggers, it triggers an additional time.

Noggle the Mind

Flash
Enchant creature
Enchanted creature loses all abilities and is a colorless Noggle with base power and toughness 1/1. (It loses all colors and all other creature types.)

Unexpected Assistance

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.)
Draw three cards, then discard a card.

Collective Inferno

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.)
As this enchantment enters, choose a creature type.
Double all damage that sources you control of the chosen type would deal.

Sanar, Innovative First-Year

Vivid — At the beginning of your first main phase, reveal cards from the top of your library until you reveal X nonland cards, where X is the number of colors among permanents you control. For each of those colors, you may exile a card of that color from among the revealed cards. Then shuffle. You may cast the exiled cards this turn.

Impolite Entrance

Target creature gains trample and haste until end of turn.
Draw a card.

Crossroads Watcher

Trample
Whenever another creature you control enters, this creature gets +1/+0 until end of turn.

Island

Tweeze

Tweeze deals 3 damage to any target. You may discard a card. If you do, draw a card.

Kulrath Zealot

When this creature enters, exile the top card of your library. Until the end of your next turn, you may play that card.
Basic landcycling {1}{R} ({1}{R}, Discard this card: Search your library for a basic land card, reveal it, put it into your hand, then shuffle.)

Burning Curiosity

As an additional cost to cast this spell, you may blight 1. (You may put a -1/-1 counter on a creature you control.)
Exile the top two cards of your library. If this spell's additional cost was paid, exile the top three cards instead. Until the end of your next turn, you may play those cards.

Run Away Together

Choose two target creatures controlled by different players. Return those creatures to their owners' hands.

Feed the Flames

Feed the Flames deals 5 damage to target creature. If that creature would die this turn, exile it instead.

Tributary Vaulter

Flying
Whenever this creature becomes tapped, another target Merfolk you control gets +2/+0 until end of turn.

Evolving Wilds

{T}, Sacrifice this land: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.

Eclipsed Flamekin

When this creature enters, look at the top four cards of your library. You may reveal an Elemental, Island, or Mountain card from among them and put it into your hand. Put the rest on the bottom of your library in a random order.

Enraged Flamecaster

Reach
Whenever you cast a spell with mana value 4 or greater, this creature deals 2 damage to each opponent.

Glamermite

Flash
Flying
When this creature enters, choose one —
• Tap target creature.
• Untap target creature.

Flaring Cinder

When this creature enters and whenever you cast a spell with mana value 4 or greater, you may discard a card. If you do, draw a card.

Squawkroaster

Double strike
Vivid — Squawkroaster's power is equal to the number of colors among permanents you control.

Scarblade Scout

Lifelink
When this creature enters, mill two cards. (Put the top two cards of your library into your graveyard.)

Spell Snare

Mountain

Stratosoarer

Flying
When this creature enters, target creature gains flying until end of turn.
Basic landcycling {1}{U} ({1}{U}, Discard this card: Search your library for a basic land card, reveal it, put it into your hand, then shuffle.)

Flamekin Gildweaver

Trample
When this creature enters, create a Treasure token. (It's an artifact with "{T}, Sacrifice this token: Add one mana of any color.")

Glen Elendra Guardian

Flash
Flying
This creature enters with a -1/-1 counter on it.
{1}{U}, Remove a counter from this creature: Counter target noncreature spell. Its controller draws a card.

Aquitect's Defenses

Flash
Enchant creature you control
When this Aura enters, enchanted creature gains hexproof until end of turn. (It can't be the target of spells or abilities your opponents control.)
Enchanted creature gets +1/+2.

Kulrath Mystic

Whenever you cast a spell with mana value 4 or greater, this creature gets +2/+0 and gains vigilance until end of turn.

Soul Immolation

As an additional cost to cast this spell, blight X. X can't be greater than the greatest toughness among creatures you control. (Put X -1/-1 counters on a creature you control.)
Soul Immolation deals X damage to each opponent and each creature they control.

Mischievous Sneakling

Changeling (This card is every creature type.)
Flash

Flame-Chain Mauler

{1}{R}: This creature gets +1/+0 and gains menace until end of turn. (It can't be blocked except by two or more creatures.)