msem-instigator

Counter target spell.

Vigilance
Ignore all effects that would prevent Mistbreaker from attacking or blocking. (If an effect says it “can't” attack or block, it still can. This ability doesn't let it attack or block if it's tapped or attack if it has summoning sickness.)

Enchant creature
Enchanted creature has hexproof.
{U}: Return Mistcharm to its owner's hand.

Extort (Whenever you cast a spell, you may pay {W/B}. If you do, each opponent loses 1 life and you gain that much life.)
Whenever Mistress of Frost extorts a spell, you may tap target artifact or creature.

Prowess
Libraries can't be searched.
Spells you cast cost {1} less to cast for each permanent you control but don't own.

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

Look at the top two cards of your library. You may put both of those cards into your graveyard or back on top of your library in any order.
Draw a card.

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

Vanguard — Whenever a creature you control attacks alone, that creature gets +3/+0 until end of turn.

First strike

Lifelink
At the beginning of your end step, you gain 1 life if you gained life this turn, and each opponent that lost life this turn loses 1 life.

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

Whenever a creature dealt damage by Mooncursed Howler this turn dies, create a 2/2 red Werewolf creature token with first strike.

Target spell or permanent becomes colorless.

Whenever you gain life, you may put target creature or planeswalker card from your graveyard on top of your library.

Sacrifice Moonlight Agent: Blocking creatures gain first strike until end of turn.

First strike
Other Harpies you control get +1/+1 and have first strike.
Whenever a Harpy you control dies, put a +1/+1 counter on Moonlight Stalker.

Flying
When Moonlit Charmer enters, tap target artifact or creature. It doesn't untap during its controller's next untap step.

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

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

Look at target player's hand and the top card of that player's library. Look at the top four cards of your library, then put them back in any order.

Flying
{1}{U}: Reveal the top card of your library. Moonwing Watcher's base power becomes equal to that card's mana value.
Prophecy {U} (Once each turn, you may exile a card with prophecy as you reveal it. When you do, you may cast it for its prophecy cost as long as it's exiled.)

Put two +1/+1 or loyalty counters on target creature or planeswalker. It gains lifelink until end of turn.

Gain control of target creature until end of turn.
Coalesce {6}{U}{B} (You may cast this from your graveyard for {6}{U}{B}. If you do, it enters as a Horror creature after it resolves. Exile it if it would leave the battlefield or not resolve.)
As long as Mortal Whims Falter is on the battlefield, you can't lose control of permanents.

Mosecf, the Sunseeker's Path enters 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.