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.

Vigilance, lifelink
Whenever Kei attacks alone, it gains first strike until end of turn.

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.

Double strike

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.

Flying
Whenever this Vehicle attacks, reveal cards from the top of your library until you reveal a nonland card. Exile that card and put the rest on the bottom of your library in a random order. You may cast the exiled card without paying its mana cost if the resulting spell has mana value 2 or less.
Crew 2

Damned — At the beginning of your end step, put a +1/+1 counter on this creature if you've sacrificed a permanent this turn.
When this creature dies, create X 1/1 black Demon Insect creature tokens, where X is this creature's power.

Ward {1}
Whenever Kynaios, Blade-Bound or attacks, reveal the top five cards of your library. You may put an Aura 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.

Level Drain deals 3 damage to target creature or planeswalker. You gain 3 life.
Add {B}{B}. Spend this mana only to pay level up costs.

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.

Vigilance, ward {1}
Whenever Lio or another enchantment creature you control enters, put a +1/+1 counter on that creature. You gain 1 life and draw a card.

Whenever this creature enters or leaves the battlefield, surveil 1.

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.

When this creature enters, mill two cards.
{2}{B/G}{B/G}, Exile this card from your graveyard: Return target creature or enchantment card from your graveyard to your hand.

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

Flash
When this creature enters, it deals damage to target creature equal to the number of creatures you control.

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