When this creature enters the battlefield, you may draw a card.

Mercenary Informer can't be the target of black spells or abilities from black sources.

: Put target nontoken Mercenary on the bottom of its owner's library.

When Merchant of Secrets enters the battlefield, draw a card.

Flying

Whenever a nontoken creature you control dies, investigate.

Clues you control have exalted. (Whenever a creature you control attacks alone, that creature gets +1/+1 until end of turn for each instance of exalted among permanents you control.)

Merchant Ship can't attack unless defending player controls an Island.

Whenever Merchant Ship attacks and isn't blocked, you gain 2 life.

When you control no Islands, sacrifice Merchant Ship.

Afflict 2 (Whenever this creature becomes blocked, defending player loses 2 life.)

, Discard a card: Merciless Eternal gets +2/+2 until end of turn.

, Discard a card: Put a -1/-1 counter on target creature. That creature can't block this turn.

, : Draw two cards.

, , Discard a card: Mercurial Chemister deals damage to target creature equal to the discarded card's mana value.

Flying

Whenever Mercurial Kite deals combat damage to a creature, tap that creature. That creature doesn't untap during its controller's next untap step.

Mercurial Spelldancer can't be blocked.

Whenever you cast a noncreature spell, put an oil counter on Mercurial Spelldancer.

Whenever Mercurial Spelldancer deals combat damage to a player, you may remove two oil counters from it. If you do, when you next cast an instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy.

Whenever another creature you control dies, you get an experience counter.

At the beginning of your end step, choose target creature card in your graveyard. If that card's mana value is less than or equal to the number of experience counters you have, return it to the battlefield. Otherwise, put it into your hand.

When Merfolk Branchwalker enters the battlefield, it explores. (Reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on this creature, then put the card back or put it into your graveyard.)

: Merfolk Coralsmith gets +1/-1 until end of turn.

When Merfolk Coralsmith dies, scry 2.

: Draw a card, then discard a card.

Other Merfolk you control get +1/+1.

Flash (You may cast this spell any time you could cast an instant.)

When Merfolk Pupil enters the battlefield, draw a card, then discard a card.

, Exile Merfolk Pupil from your graveyard: Draw a card, then discard a card.

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)

: Tap target creature without flying.

When Merfolk Seer dies, you may pay . If you do, draw a card.

Flying

Whenever Merfolk Skyscout attacks or blocks, untap target permanent.

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)

Whenever Merfolk Spy deals combat damage to a player, that player reveals a card at random from their hand.

When Merfolk Traders enters the battlefield, draw a card, then discard a card.

Flying

When Merfolk Wayfinder enters the battlefield, reveal the top three cards of your library. Put all Island cards revealed this way into your hand and the rest on the bottom of your library in any order.

Tap an untapped nontoken artifact you control: Add .

Tap two untapped nontoken artifacts you control: Exile the top card of your library. You may play it this turn.

Reach

Domain — When Meria's Outrider enters the battlefield, it deals damage to each opponent equal to the number of basic land types among lands you control.

: Target player exiles a card from their graveyard.

Whenever you cast a black spell, you may untap Merrow Bonegnawer.

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)

When Merrow Harbinger enters the battlefield, you may search your library for a Merfolk card, reveal it, then shuffle and put that card on top.

Other Merfolk creatures you control get +1/+1.

Whenever you cast a Merfolk spell, you may tap or untap target permanent.

When Merrow Witsniper enters the battlefield, target player mills a card.

Haste

Merry, Esquire of Rohan has first strike as long as it's equipped.

Whenever you attack with Merry and another legendary creature, draw a card.

Flying

When Mesa Cavalier enters the battlefield, you gain 2 life.

Whenever you cast an enchantment spell, you may draw a card.

As long as it's not your turn, Mesa Lynx gets +0/+2.

Lifelink

Counter target spell with mana value 3 or less. (Then exile this card. You may cast the creature later from exile.)

When Mesmerizing Benthid enters the battlefield, create two 0/2 blue Illusion creature tokens with "Whenever this creature blocks a creature, that creature doesn't untap during its controller's next untap step."

Mesmerizing Benthid has hexproof as long as you control an Illusion.

Flying

When Messenger Falcons enters the battlefield, draw a card.

Cards in the winning deck(s) of the latest Mythic Championship cost more to cast.

This spell costs less to cast, where X is the total mana value of noncreature artifacts you control.

Sacrifice two artifacts: Return Metalwork Colossus from your graveyard to your hand.

Threshold — Metamorphic Wurm gets +4/+4 as long as seven or more cards are in your graveyard.

Metathran Elite can't be blocked as long as it's enchanted.

Flying

Metathran Transport can't be blocked by blue creatures.

: Target creature becomes blue until end of turn.

When Meteor Golem enters the battlefield, destroy target nonland permanent an opponent controls.

Flying, vigilance

You have hexproof.

Whenever Metropolis Reformer is dealt damage, you gain that much life.

Whenever Mezzio Mugger attacks, exile the top card of each player's library. You may play those cards this turn, and you may spend mana as though it were mana of any color to cast those spells.

Blitz (If you cast this spell for its blitz cost, it gains haste and "When this creature dies, draw a card." Sacrifice it at the beginning of the next end step.)

When Miasmic Mummy enters the battlefield, each player discards a card.

When Michonne enters the battlefield, create two Walker tokens.

As long as Michonne is equipped, she must be blocked if able.

Whenever Michonne and at least two Zombies attack, she gains indestructible until end of turn.

When Midnight Arsonist enters the battlefield, destroy up to X target artifacts without mana abilities, where X is the number of Vampires you control.

Wither (This deals damage to creatures in the form of -1/-1 counters.)

At the beginning of your upkeep, put a -1/-1 counter on each nonblack creature.