msem-instigator

{T}: Add one mana of any color. Put a creation counter on Effigy of Ivory Fire.
{2}: Effigy of Ivory Fire becomes a 4/4 red Dragon artifact creature with flying until end of turn. Activate only if Effigy of Ivory Fire has three or more creation counters on it.

Elaborate Firecannon doesn't untap during your untap step.
{4}, {T}: Elaborate Firecannon deals 2 damage to any target.
At the beginning of your upkeep, you may discard a card. If you do, untap Elaborate Firecannon.

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
Whenever you cast a noncreature spell, you may have Elegant Fireslinger deal 1 damage to target creature.

{T}: Add {C}.
{4}, {T}, Sacrifice Eon Campfire: Destroy target artifact or nonbasic land.

Choose one —
• Fatefire deals X damage to target creature. It loses indestructible until end of turn.
• Fatefire deals 2 damage to each creature if X is 2. Creatures dealt damage this way lose indestructible until end of turn.

Haste
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
When Favoured Firebrand dies, you may pay {U}{R} any number of times. Whenever you do, Favoured Firebrand deals 2 damage to any target and you draw a card.

Choose one —
• Target attacking creature gets +2/+2 until end of turn.
• Destroy target artifact.

Fire and Ashes deals X damage to any target. If a creature dealt damage this way would die this turn, exile it instead.

Fire from Above deals 2 damage to target opponent and each creature with flying that player controls.

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

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

This spell can't be countered.
Firebloom deals 3 damage to target creature or planeswalker.

Choose target creature you control, then choose two —
• Put a +1/+1 counter on it.
• Put a first strike counter on it.
• Put a trample counter on it.

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

Create three 1/1 red Elemental creature tokens.

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.

Fires of Renewal deals 2 damage to each creature.
Create a Treasure token.

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

If an opponent controls three or more attacking creatures, you may cast this spell as though it had flash.
Firewall Trap deals 5 damage to target creature. When that creature dies this turn, Firewall Trap deals damage equal to that creature's power to another target creature.

Forest Fire deals 4 damage to target creature or planeswalker. (Then exile this card. You may cast the creature later from exile.)

({T}: Add {U} or {R}.)
Frostfire Geysers enters tapped unless you control a basic Island or a basic Mountain.