msem-instigator

{T}: Add three mana in any combination of colors. Spend this mana only to cast artifact spells or activate abilities of artifacts.

When Final Form enters, your life total becomes 20.
At the beginning of your upkeep, destroy up to one target creature. You draw X cards and you lose X life, where X is its power.

When Final Symphony enters, exile another target nonland permanent until Final Symphony leaves the battlefield.
When Final Symphony leaves the battlefield, draw a card.

Enchant artifact
Enchanted artifact is an Equipment and has “Equipped creature gets +2/+0” and equip {0}.

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.

Whenever Firefall Praetorians attacks, exile the top card of your library then copy it. You may play the copy and/or the exiled card.

At the beginning of each combat, you may have Firefish Conjurer deal 3 damage to target creature you control. If you do, Firefish Conjurer gets +2/+0 and gains flying until end of turn.

Whenever Fireheart Centaur attacks, you may pay {2}{R}. If you do, it gets +1/+0 until end of turn for each Centaur you control.

When Fireheart Channeler dies, you may exile it. If you do, put a blaze counter on target land without a blaze counter on it. As long as that land has a blaze counter on it, it has “At the beginning of your upkeep, this land deals 1 damage to you.” (The land continues to burn after Fireheart Channeler has left the battlefield.)

Firehearth Halls enters tapped unless you control a basic Mountain.
{T}: Add {R}.
{R}{R}: Firehearth Halls becomes a 1/1 red Dwarf Warrior creature with double strike until end of turn. It's still a land.

First strike, haste
Other creatures you control with flash or haste have first strike.

Flash
When Fireshaper Adept enters, copy up to one target activated or triggered ability. You may choose new targets for the copy.

Vigilance
Other Dwarves you control get +1/+1 and have vigilance.
Whenever you activate a loyalty ability of a permanent, create two 1/1 white Dwarf creature tokens.

Whenever you make first contact, you may tap target creature. (You make first contact the first time each turn you cast a spell with a name not in your graveyard or control already.)

First strike, vigilance
Spells that your opponents cast that target First Wave Explorer cost {2} more to cast.

When Fish Out of Water enters, exile the top four cards of each library.
During each of your turns, you may cast a card exiled with Fish Out of Water without paying its mana cost.

Haste
Stampede — Whenever Fissure Bull and a creature with greater power attack, you may sacrifice a land. If you do, search your library for a basic land or Desert card, put that card onto the battlefield tapped, then shuffle.

Enchant creature
When Fists of Ironwood enters, create two 1/1 green Saproling creature tokens.
Enchanted creature has trample.

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 Flamboyant Inventor enters, create a tapped colorless Powercell artifact token with “{T}: Add {C}.”
At the beginning of each combat, you may have Powercells you control become 2/2 Construct creatures with vigilance in addition to their other types until end of turn.

When Flame Ascetic enters, 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.

When Flame Juggler dies, it deals 3 damage to each opponent.

Experience (Whenever this creature attacks, if it has fewer than three +1/+1 counters on it, put a +1/+1 counter on it.)
When Flame-Tailed Lizard has three or more +1/+1 counters on it, remove them all and transform it.

Flying, first strike
Whenever this creature transforms into Flame-Tested Dragon or attacks, it deals 1 damage to each creature you don't control.