You may choose not to untap Mana Leech during your untap step.

: Tap target land. It doesn't untap during its controller's untap step for as long as Mana Leech remains tapped.

Players can't cast spells that share a color with the spell most recently cast this turn.

If you tap a permanent for mana, it produces twice as much of that mana instead.

Sacrifice any number of lands, then add that much .

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

Counter target spell unless its controller pays .

Mana Vault doesn't untap during your untap step.

At the beginning of your upkeep, you may pay . If you do, untap Mana Vault.

At the beginning of your draw step, if Mana Vault is tapped, it deals 1 damage to you.

: Add .

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.

At the beginning of your end step, you may reveal your hand and put all land cards from it onto the battlefield. If you do, discard your hand.

Enchant creature

Enchanted creature can't attack.

: Enchanted creature gets -1/-1 until end of turn.

: Enchanted creature can't block this turn.

: Add or . Activate no more than three times each turn.

: Add one mana of any color.

Whenever you cast a spell, Manaplasm gets +X/+X until end of turn, where X is that spell's mana value.

: Exile Mangara of Corondor and target permanent.

As Mangara's Equity enters, choose black or red.

At the beginning of your upkeep, sacrifice Mangara's Equity unless you pay .

Whenever a creature of the chosen color deals damage to you or a white creature you control, Mangara's Equity deals that much damage to that creature.

Enchant creature

Enchanted creature gets +2/+2 and can't block.

Search your library for three cards, exile them, then shuffle.

Draw a card.

Defender

Manor Gargoyle has indestructible as long as it has defender.

: Until end of turn, Manor Gargoyle loses defender and gains flying.

When Man-o'-War enters, return target creature to its owner's 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.

: Mantis Engine gains flying until end of turn. (It can't be blocked except by creatures with flying or reach.)

: Mantis Engine gains first strike until end of turn. (It deals combat damage before creatures without first strike.)

Players can't draw cards.

At the beginning of each player's draw step, that player loses 3 life, searches their library for a card, puts it into their hand, then shuffles.

Protection from white

Marauding Knight gets +1/+1 for each Plains your opponents control.

Maraxus of Keld's power and toughness are each equal to the number of untapped artifacts, creatures, and lands you control.

Marble Diamond enters tapped.

: Add .

Creatures with power 3 or greater don't untap during their controllers' untap steps.

Each noncreature artifact is an artifact creature with power and toughness each equal to its mana value. (Equipment that's a creature can't equip a creature.)

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

Other creatures you control have dethrone.

Whenever a creature you control with a +1/+1 counter on it dies, return that card to the battlefield under your control at the beginning of the next end step.

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.

Rampage 1 <I>(Whenever this creature becomes blocked, it gets +1/+1 until end of turn for each creature blocking it beyond the first.)</I>

Target creature an opponent controls blocks this turn if able. Untap that creature. Other creatures that player controls can't block this turn.

Enchant creature

At the beginning of your upkeep, return enchanted creature and all Auras attached to that creature to their owners' hands.

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.)

Enchant creature

You control enchanted creature.

At the beginning of the end step, if you control no Demons, sacrifice Mark of the Oni.

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

, Sacrifice Marker Beetles: Draw a card.

Double strike (This creature deals both first-strike and regular combat damage.)

Whenever Markov Blademaster deals combat damage to a player, put a +1/+1 counter on it.

Haste (This creature can attack and as soon as it comes under your control.)

When Markov Warlord enters, up to two target creatures can't block this turn.

Maro's power and toughness are each equal to the number of cards in your hand.

Devour 2 (As this enters, you may sacrifice any number of creatures. This creature enters with twice that many +1/+1 counters on it.)

When Marrow Chomper enters, you gain 2 life for each creature it devoured.

All Rats have fear.

, Sacrifice a Rat: Create X 1/1 black Rat creature tokens, where X is the number of Rats you control.

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

Creatures target player controls get -1/-1 until end of turn. If this spell was kicked, those creatures get -2/-2 until end of turn instead.

, Pay 1 life, Sacrifice Marsh Flats: Search your library for a Plains or Swamp card, put it onto the battlefield, then shuffle.

All creatures get -2/-0 until end of turn.

Sacrifice a Swamp: Marsh Lurker gains fear until end of turn. (It can't be blocked except by artifact creatures and/or black creatures.)

Whenever Marsh Viper deals damage to a player, that player gets two poison counters. (A player with ten or more poison counters loses the game.)

Tap any number of untapped creatures you control. You gain 4 life for each creature tapped this way.

When Marshdrinker Giant enters, destroy target Island or Swamp an opponent controls.

Create X 1/1 white Soldier creature tokens. If X is 5 or more, destroy all other creatures.

At the beginning of your upkeep, detain target creature an opponent controls. (Until your next turn, that creature can't attack or block and its activated abilities can't be activated.)