Sacrifice a creature: The next time a source of your choice would deal damage to any target this turn, prevent that damage.

When Mask of Immolation enters, create a 1/1 red Elemental creature token, then attach Mask of Immolation to it.

Equipped creature has "Sacrifice this creature: It deals 1 damage to any target."

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

As an additional cost to cast this spell, sacrifice a creature.

Search your library for a card with the same name as target nontoken creature, put that card onto the battlefield, then shuffle.

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.

Flying

Whenever another Spirit you control enters, Mausoleum Wanderer gets +1/+1 until end of turn.

Sacrifice Mausoleum Wanderer: Counter target instant or sorcery spell unless its controller pays , where X is Mausoleum Wanderer's power.

Whenever a player sacrifices a permanent, Mayhem Devil deals 1 damage to any target.

, Sacrifice Maze Skullbomb: Draw a card.

, Sacrifice Maze Skullbomb: Target creature you control gets +3/+3 and gains trample until end of turn. Draw a card. Activate only as a sorcery.

When Meadowboon leaves the battlefield, put a +1/+1 counter on each creature target player controls.

Evoke (You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters.)

When Meathook Massacre II enters, each player sacrifices X creatures.

Whenever a creature you control dies, you may pay 3 life. If you do, return that card under your control with a finality counter on it.

Whenever a creature an opponent controls dies, they may pay 3 life. If they don't, return that card under your control with a finality counter on it.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after IV.)

I — Scry 2.

II — Choose a card name.

III — When you cast a spell with the chosen name for the first time this turn, draw two cards.

IV — Look at the top card of each player's library.

Sacrifice an artifact: Megatog gets +3/+3 and gains trample until end of turn.

Enchant creature

When Melancholy enters, 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 .

Memorial to Genius enters tapped.

: Add .

, , Sacrifice Memorial to Genius: Draw two cards.

Memorial to Unity enters tapped.

: Add .

, , Sacrifice Memorial to Unity: Look at the top five cards of your library. You may reveal a creature card from among them and put it into your hand. Then put the rest on the bottom of your library in a random order.

, Sacrifice Memory Jar: Each player exiles all cards from their hand face down and draws seven cards. At the beginning of the next end step, each player discards their hand and returns to their hand each card they exiled this way.

When Memory Test enters, target opponent exiles cards from the bottom of their library until they exile five nonland cards, then turns those nonland cards face down.

Visit — Name the exiled nonland cards, then look at the exiled cards. If you named them correctly, claim the prize

Prize — Create three 1/1 red Balloon creature tokens with flying, then sacrifice Memory Test and open an Attraction.

Lights — 5, 6

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.

As an additional cost to cast this spell, sacrifice a creature or land.

Draw two cards.

Flying

Whenever Merfolk Windrobber deals combat damage to a player, that player mills a card. (They put the top card of their library into their graveyard.)

Sacrifice Merfolk Windrobber: Draw a card. Activate only if an opponent has eight or more cards in their graveyard.

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.)

, Discard a card: Draw a card.

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.

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.)

As an additional cost to cast this spell, sacrifice X Contraptions.

Assemble X plus one Contraptions. (To assemble a Contraption, put the top card of your Contraption deck face up onto one of your sprockets.)

At the beginning of your upkeep, you may put a verse counter on Midsummer Revel.

, Sacrifice Midsummer Revel: Create X 3/3 green Beast creature tokens, where X is the number of verse counters on Midsummer Revel.

As an additional cost to cast this spell, sacrifice a creature.

Target player reveals their hand and discards all cards of each of the sacrificed creature's colors.

, Sacrifice a creature: Target opponent reveals their hand. You choose a card from it. That player discards that card. Activate only as a sorcery.

If you control a Swamp, you may sacrifice a creature rather than pay this spell's mana cost.

Each player exiles two cards from their hand.

Exploit (When this creature enters, you may sacrifice a creature.)

When Mindleech Ghoul exploits a creature, each opponent exiles a card from their hand.

, , Sacrifice Mindslaver: You control target player during that player's next turn. (You see all cards that player could see and make all decisions for the player.)

All Slivers have ", Sacrifice this permanent: Target player discards a card at random. Activate only as a sorcery."

If it's your turn, you may sacrifice a Mountain rather than pay this spell's mana cost.

Mine Collapse deals 5 damage to target creature or planeswalker.

Enchant nonland permanent

Enchanted permanent is a Treasure artifact with ", Sacrifice this artifact: Add one mana of any color," and it loses all other abilities. (If it was a creature, it's no longer a creature.)

Whenever a nontoken creature you control enters, you may pay . If you do, create a token that's a copy of that creature, except it has haste and "At the beginning of the end step, sacrifice this permanent."

When Minotaur Explorer enters, sacrifice it unless you discard a card at random.

When Minsc & Boo, Timeless Heroes enters and at the beginning of your upkeep, you may create Boo, a legendary 1/1 red Hamster creature token with trample and haste.

+1: Put three +1/+1 counters on up to one target creature with trample or haste.

−2: Sacrifice a creature. When you do, Minsc & Boo, Timeless Heroes deals X damage to any target, where X is that creature's power. If the sacrificed creature was a Hamster, draw X cards.

Minsc & Boo, Timeless Heroes can be your commander.

Each opponent sacrifices a creature or enchantment.

: Add .

, , Sacrifice a creature: You gain life equal to the sacrificed creature's toughness.

Mirror Mirror enters tapped.

, , Sacrifice Mirror Mirror: Choose target player. At the beginning of the next end step, exchange life totals with that player, exchange control of all permanents you and that player control, and exchange cards in your hands, cards in your libraries, and cards in your graveyards.

, Sacrifice Mirror Universe: Exchange life totals with target opponent. Activate only during your upkeep.

Target player sacrifices a permanent.

Permanents you control have "Ward—Sacrifice a permanent."

Each artifact card in your graveyard has unearth . (: Return the card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)

, Sacrifice Mishra's Groundbreaker: Target land becomes a 3/3 artifact creature that's still a land. <I>(This effect lasts indefinitely.)</I>

Flying, first strike

At the beginning of each other player's upkeep, you may compliment that player on their game play. If you don't, sacrifice Miss Demeanor.

Flash

Flying

Champion a Faerie (When this enters, sacrifice it unless you exile another Faerie you control. When this leaves the battlefield, that card returns to the battlefield.)

When a Faerie is championed with Mistbind Clique, tap all lands target player controls.

Whenever you cast an Aura or Equipment spell, put a +1/+1 counter on Mister Gutsy.

When Mister Gutsy dies, create X Junk tokens, where X is the number of +1/+1 counters on it. (They're artifacts with ", Sacrifice this artifact: Exile the top card of your library. You may play that card this turn. Activate only as a sorcery.")

Flying

Whenever you cast a spell from anywhere other than your hand, you may pay . If you do, copy that spell and you may choose new targets for the copy. If the copy is a permanent spell, it gains haste and "At the beginning of your end step, sacrifice this permanent." (A copy of a permanent spell becomes a token.)

, Sacrifice Mnemonic Sphere: Draw two cards.

Channel — , Discard Mnemonic Sphere: Draw a card.

When another creature enters, sacrifice Mogg Bombers and it deals 3 damage to target player or planeswalker.

Sacrifice Mogg Mob: It deals 3 damage divided as you choose among one, two, or three targets.

Echo (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.)

When Mogg War Marshal enters or dies, create a 1/1 red Goblin creature token.