msem-instigator

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.

Destroy target creature. You may remove a counter from up to one target permanent.

Primal {1}{U} (During your turn, you may cast this spell for {1}{U} instead of playing a land.)
Draw two cards.

Harness (You may tap a creature you control as you cast this spell. If you do, reduce this spell's mana cost by that creature's power.)
Draw three cards.

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.

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.

Flame Jolt deals 2 damage to target creature and 1 damage to target player or planeswalker.

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

Flameblade deals 4 damage to target player or planeswalker.

When Flameboon Alchemist dies, you may put a +1/+1 counter on target creature you control.

Enchant creature you control
When Flamespeaker's Craft enters, it deals 2 damage to any target.
Enchanted creature has “{T}, Discard a card: Draw a card.”

Harness (You may tap a creature you control as you cast this spell. If you do, reduce this spell's mana cost by that creature's power.)
Flamethrower deals 4 damage to any target.

{2}: Equipped creature gets +1/+0 until end of turn.
Equip {1}

{3}{R}: Target creature can't block this turn.

Target creature you control fights another target creature. If either of those creatures would die this turn, exile it instead.

Creatures you control get +1/+1 and gain first strike until end of turn.

Target creature can't be blocked this turn.
Proliferate. (Choose any number of permanents and/or players with counters on them, then give each another counter of each kind already there.)

Flash
This spell costs {1} less to cast for each Dragon you control.
Flying

Target player mills four cards.
Inscribed creature has flying.
Inscribe {2}{U} ({2}{U}: Exile this card from your hand inscribed on a creature you control. Whenever that creature attacks, its controller may cast a copy of the inscribed card without paying its mana cost. Inscribe only as a sorcery.)

Whenever you cast a black spell, put a +1/+1 counter on Flenser's Lieutenant.
{B}{B}: Return Flenser's Lieutenant from your graveyard to your hand.

{3}{B}: Regenerate Flesh Hoarder Ghoul. (The next time this creature would be destroyed this turn, it isn't. Instead tap it, remove all damage from it, and remove it from combat.)

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.)

You may put a creature card with mana value 2 or less from your hand onto the battlefield.
Draw a card.