msem-instigator

Target creature you control gets +4/+0 and gains trample until end of turn.

{B}: Fetid Nibbler gains deathtouch until end of turn.

Whenever Field Chaplain perseveres, you gain 3 life. (A creature perseveres when it survives damage.)

Target creature you control gets +2/+2 and gains trample until end of turn.
Ferocious — You may cast Fierce Howl as though it had flash if you control a creature with power 4 or greater.

Target opponent chooses up to one creature. Destroy the rest.

Flying
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)

{R}, Sacrifice Firebelly Toad: It deals 3 damage to target player or planeswalker.

Sacrifice two other creatures: Monstrosity 2. (If this creature isn't monstrous, put two +1/+1 counters on it and it becomes monstrous.)
When Flailing Terror becomes monstrous, target opponent sacrifices two creatures.

When Flame Ascetic enters the battlefield, you may exile up to one instant card and up to one sorcery card from your graveyard. Put a +1/+1 counter on Flame Ascetic for each card exiled this way.

Whenever a creature an opponent controls dies, monstrosity 1. (If this creature isn't monstrous, put a +1/+1 counter on it and it becomes monstrous.)

When Fleshwrithe Ghoul enters the battlefield, each player sacrifices a creature.
Revive {4}{B} ({4}{B}, Exile this card from your graveyard: Create a token that's a copy of it except it has no mana cost. Revive only as a sorcery.)

When Folded Fan Recruit enters the battlefield, invigorate 1. (Choose a creature with the least power among creatures you control and put a +1/+1 counter on it.)

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
{U}{R}, Exile an instant or sorcery card from your graveyard: Foolhardy Huo gains flying and first strike until end of turn.

Invigorate 2, then target creature you control fights target creature you don't control. (Choose a creature with the least power among creatures you control and put two +1/+1 counters on it.)

{G}, {T}: Add {C}{C}.

You may put a permanent card from your hand onto the battlefield. Then each opponent may put a permanent card from their hand onto the battlefield. If one does, you may repeat this process.

Forgotten Experiment can't be blocked.

When Forlorn Murklurker dies, submerge the top card of your library. (To submerge a card, exile it, then put it on the battlefield face down under its owner's control as a 2/2 creature.)

Target creature you control gets +3/+0 and gains lifelink and indestructible until end of turn.

Haste

Fox of the Fallen Forest gets +4/+0 as long as you control a legendary creature.

When Fox of the Molten Dawn enters the battlefield, you may return target Aura card with mana value 3 or less from your graveyard to the battlefield attached to a permanent it could enchant.