msem-instigator

{T}: Add {G} or {U}.
{G}{U}, {T}: Return target creature you control to its owner's hand.

({T}: Add {G} or {U}.)
Monsoon Lagoon enters the battlefield tapped.
Cycling {2} ({2}, Discard this card: Draw a card.)

{T}: Add {R} or {G}. You lose 1 life unless you have less life than an opponent.

{T}: Add {C}.
{4}: Put a +1/+1 counter on Monument of Queens. You may have it become a 0/0 Avatar creature with flying, first strike, vigilance, trample, and lifelink until end of turn. It's still a land.

{5}, {T}, Exile a creature you control: Exile target creature.

{T}: You may put a creature card with mana value 2 from your hand onto the battlefield.

({T}: Add {B}.)
Moon of the Encroaching Night enters the battlefield tapped.
{1}{B}, {T}: Scry 1. (To scry 1, look at the top card of your library. You may put that card on the bottom of your library.)

({T}: Add {W}.)
Moon of the Final Dawn enters the battlefield tapped.
{1}{W}, {T}: Scry 1. (To scry 1, look at the top card of your library. You may put that card on the bottom of your library.)

({T}: Add {U}.)
Moon of the Frozen Dusk enters the battlefield tapped.
{1}{U}, {T}: Scry 1. (To scry 1, look at the top card of your library. You may put that card on the bottom of your library.)

({T}: Add {R}.)
Moon of the Lingering Day enters the battlefield tapped.
{1}{R}, {T}: Scry 1. (To scry 1, look at the top card of your library. You may put that card on the bottom of your library.)

({T}: Add {G}.)
Moon of the Promised Day enters the battlefield tapped.
{1}{G}, {T}: Scry 1. (To scry 1, look at the top card of your library. You may put that card on the bottom of your library.)

Moonchaser Meadow enters the battlefield tapped.
{T}: Add {W}.
{1}{W}{W}, {T}: Put a loyalty counter on each planeswalker you control.

Whenever Moonlit Lurker blocks, put a +1/+1 counter on it.

Moonlit Shore enters the battlefield tapped unless you control two or more blue and/or black permanents.
{T}: Add {U} or {B}.

{T}: Add {C}.
{T}, Exile two cards from your graveyard: Add {U} or {B}.

Moonshard Crater enters the battlefield tapped.
{T}: Add {R}.
{2}{R}, {T}: Each player sacrifices a nonbasic land.

{T}: Add {W}.
{W}, {T}: Target creature gains vigilance until end of turn.

{T}: Add {C}.
{1}, {T}, Sacrifice Morphic Verge: Choose two different basic land types. Create a colorless land token that's the chosen types.

Prowess, trample
When this creature transforms into Mortal Frame, add {R}{R}{R}.

Mortal Realms enters the battlefield tapped unless you control two or more other lands.
{T}: Add {R}.
{T}, Pay 1 life: Add {B} or {G}.

Puzzlebox (Begin the game with this and another card you own from outside the game in the command zone, locked. That card is face down until you unlock this.)
{3}: Unlock Mortal's Conundrum. If the revealed card is black, put it into your hand. Otherwise, put it on top of your library.
At the beginning of your upkeep, if Mortal's Conundrum is unlocked, you lose 2 life.

Mosecf, the Sunseeker's Path enters the battlefield tapped.
Whenever a creature you control attacks, put a creation counter on Mosecf.
{T}, Remove ten creation counters from Mosecf and sacrifice it: Creatures you control get +2/+2 and gain vigilance until end of turn. Activate only as a sorcery.

({T}: Add {B} or {G}.)
Mossy Shrine enters the battlefield tapped unless you control two or more basic lands.

Experience (Whenever this creature attacks, if it has fewer than three +1/+1 counters on it, put a +1/+1 counter on it.)

(Transform this if it's not attached to a creature. Pay {1}{W} as a sorcery to unattach it.)
Enchant creature you control
Mount of Heroes's rider gets +2/+1.
Sacrifice Mount of Heroes: Counter target spell that targets you or Mount of Heroes's rider.