Tap all lands target player controls and that player loses all unspent mana.

Whenever a land an opponent controls is tapped for mana, tap all lands that player controls that could produce any type of mana that land could produce.

: Add one mana of any color.

Manascape Refractor enters the battlefield tapped.

Manascape Refractor has all activated abilities of all lands on the battlefield.

You may spend mana as though it were mana of any color to pay the activation costs of Manascape Refractor's abilities.

You gain 5 life.

When a spell or ability an opponent controls causes you to discard Mangara's Blessing, you gain 2 life, and you return Mangara's Blessing from your graveyard to your hand at the beginning of the next end step.

When Manglehorn enters the battlefield, you may destroy target artifact.

Artifacts your opponents control enter the battlefield tapped.

Reveal the top ten cards of your library. Starting with the next opponent in turn order, each opponent chooses a different nonland card from among them. Put the chosen cards into your hand and the rest on the bottom of your library in a random order.

When Manor Guardian dies, each player seeks a nonland card with mana value 2 or less. (To seek a card, put one at random from your library into your hand.)

Manta Ray can't attack unless defending player controls an Island.

Manta Ray can't be blocked except by blue creatures.

When you control no Islands, sacrifice Manta Ray.

Search your library for a basic land card, put it onto the battlefield tapped, then shuffle. Bolster 1. (Choose a creature with the least toughness among creatures you control and put a +1/+1 counter on it.)

Marang River Prowler can't block and can't be blocked.

You may cast Marang River Prowler from your graveyard as long as you control a black or green permanent.

Whenever you gain life, each opponent loses 1 life.

Haste

When Marauding Dreadship enters the battlefield, incubate 2. (Create an Incubator token with two +1/+1 counters on it and ": Transform this artifact." It transforms into a 0/0 Phyrexian artifact creature.)

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

Flying

: Marble Gargoyle gets +0/+1 until end of turn.

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.)

Create X 1/1 white Soldier creature tokens with lifelink.

Dethrone (Whenever this creature attacks the player with the most life or tied for most life, put a +1/+1 counter on it.)

Whenever Marchesa's Infiltrator deals combat damage to a player, draw a card.

: Add , , or .

, , Sacrifice Mardu Banner: Draw a card.

Choose one —

• Mardu Charm deals 4 damage to target creature.

• Create two 1/1 white Warrior creature tokens. They gain first strike until end of turn.

• Target opponent reveals their hand. You choose a noncreature, nonland card from it. That player discards that card.

As an additional cost to cast this spell, discard a card.

Whenever Mardu Strike Leader attacks, create a 2/1 black Warrior creature token.

Dash (You may cast this spell for its dash cost. If you do, it gains haste, and it's returned from the battlefield to its owner's hand at the beginning of the next end step.)

Gain control of target creature until end of turn. Put a +1/+1 counter on it and untap it. That creature gains haste until end of turn. (It can attack and this turn.)

When Marker Beetles dies, target creature gets +1/+1 until end of turn.

, Sacrifice Marker Beetles: Draw a card.

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.)

Lifelink

Other Vampires you control get +1/+1.

Madness (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)

Lifelink (Damage dealt by this creature also causes you to gain that much life.)

Choose one or both —

• Creatures you control get +1/+0 until end of turn.

• Target Vampire you control deals damage equal to its power to another target creature.

Woman Who Walked the Earth — When Martha Jones enters the battlefield, investigate. (Create a Clue token. It's an artifact with ", Sacrifice this artifact: Draw a card.")

Whenever you sacrifice a Clue, Martha Jones and up to one other target creature can't be blocked this turn.

Doctor's companion (You can have two commanders if the other is the Doctor.)

Until end of turn, target creature you control gains ": The next 1 damage that would be dealt to target creature, planeswalker, or player this turn is dealt to this creature instead." Only you may activate this ability.

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.)

When Martyr's Soul enters the battlefield, if you control no tapped lands, put two +1/+1 counters on it.

Flash

Tapped creatures you control can block as though they were untapped.

Whenever equipped creature deals combat damage to a player, it connives X, where X is the amount of damage it dealt to that player. (Draw X cards, then discard X cards. Put a +1/+1 counter on that creature for each nonland card discarded this way.)

Equip

Massive Raid deals damage to any target equal to the number of creatures you control.

Commander creatures you own have "This creature enters the battlefield with an additional +1/+1 counter on it" and "Other creatures you control enter the battlefield with an additional +1/+1 counter on them."

When Master of Death enters the battlefield, surveil 2. (Look at the top two cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.)

At the beginning of your upkeep, if Master of Death is in your graveyard, you may pay 1 life. If you do, return it to your hand.

Master of Etherium's power and toughness are each equal to the number of artifacts you control.

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

Servos and Thopters you control get +1/+1.

: Create a 1/1 colorless Servo artifact creature token.

Whenever Mastermind Plum attacks, exile up to one target card from a graveyard. If an artifact card was exiled this way, create a Treasure token. (It's an artifact with ", Sacrifice this artifact: Add one mana of any color.")

Whenever you cast a spell, if mana from a Treasure was spent to cast it, you draw a card and you lose 1 life.

Domain — Matca Rioters's power and toughness are each equal to the number of basic land types among lands you control.

: Target creature blocks Matsu-Tribe Decoy this turn if able.

Whenever Matsu-Tribe Decoy deals combat damage to a creature, tap that creature and it doesn't untap during its controller's next untap step.

: Draw a card, then discard a card.

, : Transform Matzalantli, the Great Door. Activate only if there are four or more permanent types among cards in your graveyard. (Artifact, battle, creature, enchantment, land, and planeswalker are permanent types.)

Trample

When Maulfist Revolutionary enters the battlefield or dies, for each kind of counter on target permanent or player, give that permanent or player another counter of that kind.

Whenever one or more nontoken Vampires you control attack, create a 1/1 white Vampire creature token with lifelink.

At the beginning of your upkeep, put a +1/+1 counter on each creature you control if you control a creature with power 5 or greater. Then you gain 10 life if you control a creature with power 10 or greater. Then you win the game if you control a creature with power 20 or greater.

Flash

Enchant creature

When Maze's Mantle enters the battlefield, if enchanted creature has toxic, that creature gains hexproof until end of turn.

Enchanted creature gets +2/+2.

, , Discard a card: Regenerate target creature.

Trample

When Megatherium enters the battlefield, sacrifice it unless you pay for each card in your hand.

Enchant creature

When Melancholy enters the battlefield, tap enchanted creature.

Enchanted creature doesn't untap during its controller's untap step.

At the beginning of your upkeep, sacrifice Melancholy unless you pay .

Buyback costs cost less.

Target opponent reveals their hand. You choose a nonland card from that player's graveyard or hand and exile it.

Cycling (, Discard this card: Draw a card.)

Put target permanent card from your graveyard on top of your library. (Then exile this card. You may cast the creature later from exile.)

Flying

When Mentor of Evos Isle enters the battlefield, choose a creature card in your hand. It perpetually gains flying.