Whenever Marit Lage's Slumber or another snow permanent you control enters, scry 1.

At the beginning of your upkeep, if you control ten or more snow permanents, sacrifice Marit Lage's Slumber. If you do, create Marit Lage, a legendary 20/20 black Avatar creature token with flying and indestructible.

Flying

When Marsh Flitter enters, create two 1/1 black Goblin Rogue creature tokens.

Sacrifice a Goblin: Marsh Flitter has base power and toughness 3/3 until end of turn.

Create a 2/1 white and black Inkling creature token with flying, a 3/2 red and white Spirit creature token, and a 4/4 blue and red Elemental creature token.

, Sacrifice another creature: Add . Spend this mana only to cast Vampire, Cleric, and/or Demon spells.

You may have Masterwork of Ingenuity enter as a copy of any Equipment on the battlefield.

Target creature gets +1/+1 and gains haste until end of turn.

Jump-start (You may cast this card from your graveyard by discarding a card in addition to paying its other costs. Then exile this card.)

, Exile Mechtitan Core and four other artifact creatures and/or Vehicles you control: Create Mechtitan, a legendary 10/10 Construct artifact creature token with flying, vigilance, trample, lifelink, and haste that's all colors. When that token leaves the battlefield, return all cards exiled with Mechtitan Core except Mechtitan Core to the battlefield tapped under their owners' control.

Crew 2

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color.)

You gain 8 life.

Aftermath (Cast this spell only from your graveyard. Then exile it.)

Each player shuffles their hand and graveyard into their library, then draws seven cards.

Mephitic Ooze gets +1/+0 for each artifact you control.

Whenever Mephitic Ooze deals combat damage to a creature, destroy that creature. The creature can't be regenerated.

Mephit's Enthusiasm deals 4 damage to target creature or planeswalker. If excess damage was dealt this way, note that excess damage, then you get a boon with "When you cast your next creature spell, it perpetually gets +X/+0, where X is the noted number."

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

When Merfolk Coralsmith dies, scry 2.

Merieke Ri Berit doesn't untap during your untap step.

: Gain control of target creature for as long as you control Merieke Ri Berit. When Merieke Ri Berit leaves the battlefield or becomes untapped, destroy that creature. It can't be regenerated.

When Merrow Witsniper enters, target player mills a card.

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

Flying

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

Flying, lifelink

When Militant Angel enters, create a number of 2/2 white Knight creature tokens with vigilance equal to the number of opponents you attacked this turn.

Vigilance

: Prevent the next 1 damage that would be dealt to any target this turn.

Whenever you attack with two or more creatures, draw a card.

Militia Rallier can't attack alone.

Whenever Militia Rallier attacks, untap target creature.

Minas Tirith enters tapped unless you control a legendary creature.

: Add .

, : Draw a card. Activate only if you attacked with two or more creatures this turn.

When Mintstrosity dies, create a Food token. (It's an artifact with ", , Sacrifice this artifact: You gain 3 life.")

Flash

When Mirran Banesplitter enters, attach it to target creature you control.

Equipped creature gets +2/+0.

Equip (: Attach to target creature you control. Equip only as a sorcery.)

Vigilance

Whenever a creature you control becomes the target of a backup ability, copy that ability. You may choose new targets for the copy. This ability triggers only once each turn.

Flash

Enchant creature or Vehicle

Enchanted creature gets -3/-0.

Flash

Indestructible

When Mithril Coat enters, attach it to target legendary creature you control.

Equipped creature has indestructible.

Equip

When Mitotic Slime dies, create two 2/2 green Ooze creature tokens. They have "When this creature dies, create two 1/1 green Ooze creature tokens."

Enchant creature

Enchanted creature has trample.

Whenever all non-Wall creatures you control attack, enchanted creature gets +X/+0 until end of turn, where X is the number of attacking creatures.

Whenever players finish voting, you and each opponent who voted for a choice you voted for may scry 2.

: Add one mana of any color.

Trample

When Moldgraf Monstrosity dies, exile it, then return two creature cards at random from your graveyard to the battlefield.

When Monitor Monitor enters, open an Attraction. (Put the top card of your Attraction deck onto the battlefield.)

Once each turn, you may pay to reroll one or more dice you rolled.

When Monstrosity of the Lake enters, you may pay . If you do, tap all creatures your opponents control, then put a stun counter on each of those creatures. (If a permanent with a stun counter would become untapped, remove one from it instead.)

Islandcycling (, Discard this card: Search your library for an Island card, reveal it, put it into your hand, then shuffle.)

Ninjutsu (, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)

Whenever Moon-Circuit Hacker deals combat damage to a player, you may draw a card. If you do, discard a card unless Moon-Circuit Hacker entered this turn.

When Moonlit Scavengers enters, if you control an artifact or enchantment, return target creature an opponent controls to its owner's hand.

Whenever a creature dies, you gain 1 life.

Exchange your graveyard and library. Then shuffle your library.

Changeling (This card is every creature type.)

You may have Moritte of the Frost enter as a copy of a permanent you control, except it's legendary and snow in addition to its other types and, if it's a creature, it enters with two additional +1/+1 counters on it and has changeling.

This spell costs less to cast if you gained life this turn.

Destroy target nonland permanent.

Kicker (You may pay an additional as you cast this spell.)

If Moss-Pit Skeleton was kicked, it enters with three +1/+1 counters on it.

Whenever one or more +1/+1 counters are put on a creature you control, if Moss-Pit Skeleton is in your graveyard, you may put Moss-Pit Skeleton on top of your library.

: Until end of turn, whenever you cast a black spell, put a +1/+1 counter on Mountain Titan.

Flash

When Munitions Expert enters, you may have it deal damage to target creature or planeswalker equal to the number of Goblins you control.

, : Look at the top X cards of your library, where X is the highest mana value among artifacts you control. You may put an artifact card from among them onto the battlefield. Put the rest on the bottom of your library in any order.

When Myr Kinsmith enters, you may search your library for a Myr card, reveal it, put it into your hand, then shuffle.

Whenever you cast an artifact spell, you may pay . If you do, create a 1/1 colorless Myr artifact creature token.

Lands you control have ": Add one mana of any color."

If a Wizard you control entering causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time.

+2: Create a 1/1 white Kor Soldier creature token. You may attach an Equipment you control to it.

−2: You may put an Equipment card from your hand or graveyard onto the battlefield.

−10: Create a colorless Equipment artifact token named Stoneforged Blade. It has indestructible, "Equipped creature gets +5/+5 and has double strike," and equip .

Nahiri, the Lithomancer can be your commander.

Cumulative upkeep (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)

If tapped for mana, Plains produce , Islands produce , Swamps produce , Mountains produce , and Forests produce instead of any other type.

All lands become 2/2 creatures until end of turn. They're still lands.