Whenever an opponent casts a spell, you have five seconds to choose a keyword you haven't chosen for a card named Modular Monstrosity today that's been printed on a creature card. If you do, Modular Monstrosity gains that ability. Otherwise, Modular Monstrosity loses all keyword abilities.

Mogg Toady can't attack unless you control more creatures than defending player.

Mogg Toady can't block unless you control more creatures than attacking player.

: Put a +1/+1 counter on Molten Hydra.

, Remove all +1/+1 counters from Molten Hydra: It deals damage to any target equal to the number of +1/+1 counters removed this way.

Each player shuffles the cards from their hand into their library, then draws that many cards.

Metalcraft — If you control three or more artifacts, Molten Psyche deals damage to each opponent equal to the number of cards that player has drawn this turn.

Flying

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

Whenever you cast a green creature spell, you may search your library for a creature card and reveal it. If you do, shuffle your library and put that card on top of it.

Whenever you cast a blue creature spell, reveal the top card of your library. If it's a creature card, put that card into your hand.

Megamorph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its megamorph cost and put a +1/+1 counter on it.)

When Monastery Loremaster is turned face up, return target noncreature, nonland card from your graveyard to your hand.

As Monastery Siege enters the battlefield, choose Khans or Dragons.

• Khans — At the beginning of your draw step, draw an additional card, then discard a card.

• Dragons — Spells your opponents cast that target you or a permanent you control cost more to cast.

Whenever a nontoken creature you control dies,

Augment (, Reveal this card from your hand: Combine it with target host. Augment only as a sorcery.)

As Monkey Monkey Monkey enters the battlefield, choose a letter.

Monkey Monkey Monkey gets +1/+1 for each nonland permanent whose name begins with the chosen letter.

Trample

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

Draw cards equal to the converted mana cost of the sacrificed permanent.

Destroy target creature or enchantment.

Mortuary Mire enters the battlefield tapped.

When Mortuary Mire enters the battlefield, you may put target creature card from your graveyard on top of your library.

: Add .

Mountain Valley enters the battlefield tapped.

, Sacrifice Mountain Valley: Search your library for a Mountain or Forest card, put it onto the battlefield, then shuffle your library.

Vigilance, trample

If one or more +1/+1 counters would be put on Mowu, Loyal Companion, that many plus one +1/+1 counters are put on it instead.

+2: Target creature can't be blocked this turn.

−3: Draw two cards.

−10: Tap all creatures your opponents control. You take an extra turn after this one.

+2: Until your next turn, up to one target creature gets -2/-0 and loses flying.

−3: Create a 4/4 blue Elemental Bird creature token with flying.

−8: You get an emblem with "Islands you control have ‘: Draw a card.'"

Reach, trample

Multani, Yavimaya's Avatar gets +1/+1 for each land you control and each land card in your graveyard.

, Return two lands you control to their owner's hand: Return Multani from your graveyard to your hand.

Enchant creature

Enchanted creature has ": Add one mana of any color."

Creatures with no abilities get +2/+2.

, Pay half your life, rounded up: Destroy target nonblack creature. It can't be regenerated.

Reveal the top three cards of your library. An opponent chooses one of them. Put that card into your graveyard and the rest into your hand.

Target creature an opponent controls deals damage equal to its power to another target creature that player controls.

, : Say the flavor text on a card in your hand. Target opponent guesses that card's name. You may reveal that card. If you do and they guessed wrong, you draw a card.

At the beginning of your upkeep, put a spore counter on Mycologist.

Remove three spore counters from Mycologist: Create a 1/1 green Saproling creature token.

Sacrifice a Saproling: You gain 2 life.

Mycosynth Fiend gets +1/+1 for each poison counter your opponents have.

All permanents are artifacts in addition to their other types.

All cards that aren't on the battlefield, spells, and permanents are colorless.

Players may spend mana as though it were mana of any color.

Myojin of Cleansing Fire enters the battlefield with a divinity counter on it if you cast it from your hand.

Myojin of Cleansing Fire has indestructible as long as it has a divinity counter on it.

Remove a divinity counter from Myojin of Cleansing Fire: Destroy all other creatures.

Myojin of Life's Web enters the battlefield with a divinity counter on it if you cast it from your hand.

Myojin of Life's Web has indestructible as long as it has a divinity counter on it.

Remove a divinity counter from Myojin of Life's Web: Put any number of creature cards from your hand onto the battlefield.

Myojin of Seeing Winds enters the battlefield with a divinity counter on it if you cast it from your hand.

Myojin of Seeing Winds has indestructible as long as it has a divinity counter on it.

Remove a divinity counter from Myojin of Seeing Winds: Draw a card for each permanent you control.

When Myr Battlesphere enters the battlefield, create four 1/1 colorless Myr artifact creature tokens.

Whenever Myr Battlesphere attacks, you may tap X untapped Myr you control. If you do, Myr Battlesphere gets +X/+0 until end of turn and deals X damage to the player or planeswalker it's attacking.

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

, : Untap each other Myr you control.

: Target land becomes an artifact in addition to its other types until end of turn.

, : Shuffle your library.

, : Create a token that's a copy of Myr Propagator.

: Switch Myr Quadropod's power and toughness until end of turn.

When Myr Retriever dies, return another target artifact card from your graveyard to your hand.

When Myr Sire dies, create a 1/1 colorless Myr artifact creature token.

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

, Tap five untapped Myr you control: Search your library for a Myr creature card, put it onto the battlefield, then shuffle your library.

Myriad Landscape enters the battlefield tapped.

: Add .

, , Sacrifice Myriad Landscape: Search your library for up to two basic land cards that share a land type, put them onto the battlefield tapped, then shuffle your library.

Draw two cards.

Landfall — If you had a land enter the battlefield under your control this turn, draw three cards instead.

Flying

Each creature you control that has an Adventure enters the battlefield with an additional +1/+1 counter on it. (It doesn't need to have gone on the adventure first.)

When Mystic Barrier enters the battlefield or at the beginning of your upkeep, choose left or right.

Each player may attack only the nearest opponent in the last chosen direction and planeswalkers controlled by that opponent.

Choose three. You may choose the same mode more than once.

• Counter target spell unless its controller pays .

• Return target creature to its owner's hand.

• Draw a card.

All creatures lose flying and islandwalk.

Protection from black

Threshold — As long as seven or more cards are in your graveyard, Mystic Enforcer gets +3/+3 and has flying.

You may look at the top card of your library any time.

You may cast artifact spells and colorless spells from the top of your library.

, Pay 1 life: Exile the top card of your library.

Counter target spell. Create an X/X green Ooze creature token, where X is that spell's converted mana cost.

Destroy target artifact or enchantment.

Draw a card at the beginning of the next turn's upkeep.