msem-instigator

Counter target spell unless its controller pays {1}. If you control a creature with flying, counter that spell unless its controller pays {4} instead.

Flying
Crew 2 (Tap any number of creatures you control with total power 2 or greater: This Vehicle becomes an artifact creature until end of turn.)

Menace
Lonely Devil can't attack or block alone.

Trample
Augmented — When Lonely Giant enters, if you've spent {W}{U}{B}{R}{G} to cast spells this turn, put two +1/+1 counters on it.

Return target creature card from your graveyard to your hand. If you control a Spirit, draw a card.

Flying, deathtouch

When Long Journey enters, exile target creature or planeswalker an opponent controls until Long Journey leaves the battlefield.

When Long Lost Cause enters, each opponent exiles a card from their hand or a creature they control.

Long-Lived Prowler gets +3/+0 as long as there are four or more card types among cards in your graveyard.

Look at the top four cards of your library. You may reveal a creature or land card from among them and put it into your hand. Put the rest into your graveyard.

As an additional cost to cast this spell, sacrifice an artifact or creature.
Draw two cards.

You lose 2 life. Look at the top two cards of your library. You may mill two cards. Draw two cards, then mill two cards if you didn't mill before.

Choose one —
• Return target creature card from your graveyard to your hand.
• Return two target creature cards with total mana value 4 or less from your graveyard to your hand.

Flying (This creature can't be blocked except by creatures with flying or reach.)

Instant, sorcery, and legendary spells you cast cost {1} less to cast.

Return target nonland permanent to its owner's hand.
Dominance — If you control the creature with the greatest power or tied for the greatest power, you may put that permanent on top of its owner's library instead.

Tap target creature. Prevent all damage that would be dealt to and dealt by that creature this turn.

Counter target spell. Create a 1/1 blue Elemental creature token with flying.

When Lost Crew enters or dies, crystallize. (Put a +1/+1 counter on a creature you control or create a Treasure.)

Heretic (Whenever you cast a spell that doesn't share a color with this creature, it gets +1/+1 until end of turn.)
{1}{B}: Lost Dancer becomes black and gains lifelink until end of turn.

Lost Explorer has first strike as long as it's attacking.
{1}{B}, Exile Lost Explorer from your graveyard: Crystallize. (Put a +1/+1 counter on a creature you control or create a Treasure.)

When Lost Kitten leaves the battlefield, create a 1/1 white Peasant creature token.

Enchant opponent
When Lost Knowledge enters, enchanted player reveals their hand.
{1}, Sacrifice Lost Knowledge: Scry 2, then draw a card.

Choose two —
• You gain 3 life.
• Lost Memories deals 3 damage to any target.
• Investigate. (Create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”)

Target player discards two cards.