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.

Indulgence
Whenever you indulge, create a 1/1 blue Gargoyle artifact creature token with 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.

Flying
When Marbled Messenger enters, draw a card.

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.

When Meat-Market Heifer is put into a graveyard from anywhere, create a Food token.

Create two 1/1 blue Wizard creature tokens with prowess.

{3}{W}: Meowsician dares 4.
Whenever a creature you control becomes a Rebel, create a 1/1 white Warrior creature token.

When Merciless Headsman enters, create a 2/2 colorless Minion creature token with decayed.
{1}{B}, Sacrifice another creature: Draw a card.

Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle. Then if you control three or more enchantments, draw a card.

When Minister of Utility enters, make a pledge.
{2}, Sacrifice a Clique: Make a pledge.

Solidarity
When Minoan Engineer dies, create a 1/1 colorless Thopter artifact creature token with flying.