You may have Karina's Substitute enter as a copy of a creature you control, except it's 1/4 and a Toy in addition to its other types.

Whenever an opponent gains life or draws a card during your turn, you do the same.
[+1]: You may discard a card. If you do, each player may draw a card.
[+1]: For each player, up to one target creature they control gains vigilance and lifelink until end of turn.
[–7]: Choose a card type. Each opponent who controls more permanents of that type than you sacrifices a number equal to the difference.

Choose one. If your devotion to blue is three or greater, you may choose another. The same is true for devotion to red.
• Return target sorcery card from your graveyard to your hand.
• Return target nonland permanent to its owner's hand.
• Destroy target artifact.

Indestructible
As long as your devotion to blue and red is less than seven, Keranos isn't a creature.
Noncreature spells you cast cost {1} less to cast.
Whenever you cast a noncreature spell, Keranos deals 1 damage to each opponent.

Vigilance, reach, trample
Ward—Sacrifice a noncreature permanent.

Choose one. If your devotion to green is three or greater, you may choose another. The same is true for devotion to red.
• Put two +1/+1 counters on target creature.
• Target creature you control fights target creature you don't control.
• Klothys's Judgment deals 3 damage to target player.

Vigilance
Whenever Kynaios, Blade-Bound enters or attacks, reveal the top five cards of your library. You may put an enchantment card or a card with a Blessing from among them into your hand. Put the rest on the bottom of your library in any order.

Lifelink
Whenever Laboratory Mentor attacks, teach target attacking creature with lesser power lifelink.

Enchant creature
When Left to the Sea enters, tap enchanted creature.
Enchanted creature doesn't untap during its controller's untap step.

Choose one —
• Counter target spell unless its controller pays {3}.
• You gain 3 life and draw a card.

Whenever Leonin Wildstar attacks, if its power is 4 or greater, it gains first strike until end of turn.

When Leyrune Collector enters, look at the top four cards of your library. You may reveal an artifact or land card from among them and put it into your hand. Put the rest on the bottom of your library in a random order. If you revealed a land this way, you may put a land card from your hand onto the battlefield tapped.
Wander {3}{G}{U}

This spell costs {2} less to cast if you attacked with a legendary creature this turn.
Exile the top two cards of your library. Until the end of your next turn, you may play those cards.

{T}: Add {R}{R}{R}. Spend this mana only to cast creature spells. If that mana is spent on a creature spell, it enters with an additional haste counter and decayed counter on it.

{5}: Lightspeed Cruiser becomes an artifact creature until end of turn.
Crew 2

Enchant land
When Lightvein Discovery enters, put a +1/+1 counter on target creature you control.
Enchanted land has “{T}: Add two mana of different colors.”

{1}, {T}: Target land you control becomes a 4/4 Elemental creature with lifelink, haste, and “When this creature dies, draw a card.” It's still a land. Sacrifice it at the beginning of the next end step.

Create a 2/2 blue Drake creature token with flying.
Whenever a creature you control enters, if it wandered, you may exile Lofty Frontiers from your graveyard. If you do, create a 2/2 blue Drake creature token with flying.

Flying
When Lofty Voter enters, make a pledge.

Flash
Flying, lifelink
Your opponents can't create tokens.

Choose two —
• Create two Berry tokens.
• Create two 1/1 green Plant creature tokens.
• You gain 1 life for each token you control.

{2}: Magnetic Mystery gets +1/+0 until end of turn. Activate only as a sorcery.
As long as you control another artifact, Magnetic Mystery has flying.

Exile the top X cards of target opponent's library. You may play those cards for as long as they remain exiled, and you may pay {VP}{VP}{B} rather than pay the mana costs of those spells.

{2}, {T}: Exile target creature you control, then reveal the top card of your library. If the revealed card is a creature card, put it onto the battlefield. Otherwise, return the exiled card to the battlefield under its owner's control.

Sacrifice a Treasure: Put a loyalty counter on Marilye, Dreaming Big.
[+1]: Draw a card, then discard a card. If you discarded a nonland card this way, create a tapped Treasure token.
[–3]: Gain control of target artifact. It becomes a Treasure artifact, loses all other types, and loses all abilities except for activated mana abilities.
[–8]: Target opponent chooses a nonland permanent they control. You gain control of the rest.