Lord of the Unreal

Creature — Human Wizard (2/2)

Illusion creatures you control get +1/+1 and have hexproof. (They can't be the targets of spells or abilities your opponents control.)

Lore Broker

Creature — Human Rogue (1/2)

: Each player draws a card, then discards a card.

Ludevic's Test Subject // Ludevic's Abomination

Creature — Lizard Egg // Creature — Lizard Horror (0/3)

Defender
: Put a hatchling counter on Ludevic's Test Subject. Then if there are five or more hatchling counters on it, remove all of them and transform it.

Ludevic's Abomination

Trample

Lumengrid Warden

Creature — Human Wizard (1/3)

Magical Hacker

Creature — Human Gamer (1/2)

: Change the text of target spell or permanent by replacing all instances of + with -, and vice versa, until end of turn.

Magus of the Bazaar

Creature — Human Wizard (0/1)

: Draw two cards, then discard three cards.

Maritime Guard

Creature — Merfolk Soldier (1/3)

Master of the Pearl Trident

Creature — Merfolk (2/2)

Other Merfolk creatures you control get +1/+1 and have islandwalk. (They can't be blocked as long as defending player controls an Island.)

Merfolk Assassin

Creature — Merfolk Assassin (1/2)

: Destroy target creature with islandwalk.

Merfolk Looter

Creature — Merfolk Rogue (1/1)

: Draw a card, then discard a card.

Merfolk Mesmerist

Creature — Merfolk Wizard (1/2)

, : Target player mills two cards.

Merfolk Raiders

Creature — Merfolk Soldier (2/3)

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
Phasing (This phases in or out before you untap during each of your untap steps. While it's phased out, it's treated as though it doesn't exist.)

Metathran Soldier

Creature — Metathran Soldier (1/1)

Metathran Soldier can't be blocked.

Metathran Zombie

Creature — Metathran Zombie (1/1)

: Regenerate Metathran Zombie.

Metropolis Sprite

Creature — Faerie Rogue (1/2)

Flying
: Metropolis Sprite gets +1/-1 until end of turn.

Minamo Sightbender

Creature — Human Wizard (1/2)

, : Target creature with power X or less can't be blocked this turn.

Mindshrieker

Creature — Spirit Bird (1/1)

Flying
: Target player mills a card. Mindshrieker gets +X/+X until end of turn, where X is the milled card's mana value.

Mistfolk

Creature — Illusion (1/2)

: Counter target spell that targets Mistfolk.

Mistform Stalker

Creature — Illusion (1/1)

: Mistform Stalker becomes the creature type of your choice until end of turn.
: Mistform Stalker gets +2/+2 and gains flying until end of turn.

Moat Piranhas

Creature — Fish (3/3)

Defender (This creature can't attack.)