msem-instigator

Erosive Path enters tapped unless you control one or fewer other lands.
{T}: Add {B} or {R}.
Cycling {2} ({2}, Discard this card: Draw a card.)

Once each turn, when Eruq, the Flamebearer enters or you attack with one or more Horrors, you may have Eruq deal 2 damage to each opponent. Then if Eruq isn't a token, gain control of target creature an opponent controls until end of turn. Tap it. It's attacking its controller.
{2}{R}{R}, Discard Eruq: Create a token that's a copy of Eruq, the Flamebearer, except it's 4/4 and isn't legendary. Activate only as a sorcery.

{T}: Put target permanent you own on the bottom of your library.
{1}, {T}: Add one mana of any color. When that mana is spent, target opponent loses 1 life.

{1}{G}: Return another target permanent you control to its owner's hand.
{X}{G}: You may put a creature card with mana value X or less from your hand onto the battlefield. It gains trample and haste until end of turn.

When Eternity's Eye enters, look at the top seven cards of your library. Put up to three of them into your graveyard and the rest on the bottom of your library in a random order.
{T}: Add one mana of any color.
{2}: Put target card from a graveyard on the bottom of its owner's library.

{B}, {T}: Exile target creature card from a graveyard. You gain 2 life.
{1}{B}, {T}: Mill three cards. You lose 2 life.
{3}{B}{B}, {T}, Sacrifice Ethics and Reanimation: Return target creature card from your graveyard to the battlefield. Activate only as a sorcery.

Put up to one target artifact, instant, or sorcery card from your graveyard on top of your library.
Investigate twice. (Create two colorless Clue artifact tokens with “{2}, Sacrifice this artifact: Draw a card.”)

Whenever you cast your second spell each turn, Expressive Performer deals 1 damage to each opponent.
{3}{R}, {T}, Exert Expressive Performer: It deals 2 damage to each player. (An exerted creature won't untap during your next untap step.)

You may exert Extoller of Effort as it attacks. (An exerted creature won't untap during your next untap step.)
Whenever you exert a creature, create a 1/1 white Human creature token.

Equipped creature has hexproof and improve {1}. ({1}: Put a +1/+1 counter on that creature. This costs {1} more to activate for each +1/+1 counter on it. Improve only as a sorcery.)
{4}: Put Faithforged Pauldron from your hand onto the battlefield attached to target creature.
Equip {1}

Voracious 2 (As this enters, you may sacrifice up to two artifacts and/or creatures. This creature enters with that many +1/+1 counters on it.)
Vigilance, haste
{T}: Add {G}. If a creature died under your control this turn, add {G}{G} instead.

Flying, ward {2}
Whenever Faraway Albatross attacks, choose one —
• Faraway Albatross gets +1/+1 until end of turn for each spell you've cast this turn.
• Investigate. (Create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”)

Choose one —
• Exile all creature tokens.
• Exile target creature or planeswalker.
• Each opponent exiles a card from their hand and loses 2 life.

Choose one. If you attacked with a creature with mana value 5 or greater this turn, you may choose any number instead.
• Destroy target artifact.
• Destroy target land.
• Fate of the World deals 3 damage divided as you choose among one, two, or three targets.

When Faulty Lock enters or is put into a graveyard from the battlefield, choose a creature you control. Whenever that creature deals combat damage to a player this turn, draw a card.
{2}{U}: Sacrifice Faulty Lock. Activate only as a sorcery.

Create a 3/2 colorless Horror creature token. All other creatures get -3/-3 until end of turn.

Flying
You may exert Fervent Igmel as it attacks. When you do, add {R}{R}{R}{R}. Until end of turn, you don't lose this mana as steps and phases end. (An exerted creature won't untap during your next untap step.)

Exile the top three cards of your library. Until the end of your next turn, you may play those cards.

Flamebearer's Domain enters tapped.
{T}: Add {R}.

You may exert Fleetfooted Survivalist as it attacks. (An exerted creature won't untap during your next untap step.)
Whenever an exerted creature you control deals combat damage to a player, draw a card.

Menace
Whenever an opponent activates an ability that isn't a mana ability, Flensing Tormentor deals 1 damage to that player.

Fleshweaver's Domain enters tapped.
{T}: Add {G}.

Flash
Flying
Whenever another Spirit you control enters, put a +1/+1 counter on Flickers in the Night.

Whenever a creature you control deals combat damage to a player, you may draw a card.
Fleeting {1}{U} (You may cast this spell for its fleeting cost. If you do, sacrifice it at the beginning of the next end step.)

Whenever Font of Natural Essence enters or is put into a graveyard from the battlefield, create two 1/1 green Saproling creature tokens.