msem-instigator

Put a +1/+1 counter on target creature you control if it's a Warrior. Then it fights up to one target creature you don't control.

Flying, first strike, lifelink

Once each turn, you may cast a creature you control from the battlefield.
(You can cast its Adventure this way.)

Chosen one ({W}{U}{B}{R}{G}: Transform this permanent.)
Whenever Fervent Ensign attacks, add {R} at the beginning of your next main phase.

Haste

Choose X —
• Return target spell to its owner's hand.
• Scry 3.
• Draw a card.

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.

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

Instant and sorcery spells you cast cost {1} less to cast.

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}.

Reach, trample
Whenever this creature transforms into Flourishing Companion or attacks, untap all lands you control.

Creatures your opponents control get -1/-1 until end of turn. (Then exile this card. You may cast the creature later from exile.)

Flying
Whenever a creature you control attacks, you gain 1 life.

Target creature gets +2/+1 until end of turn. (Then exile this card. You may cast the creature later from exile.)

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

When Form of the Sunbird enters, it deals 4 damage to each creature. Your life total becomes 4.
If you would lose the game, instead transform Form of the Sunbird.

Trample
Whenever Forthright Wrecker deals combat damage to a player or noncreature permanent, it deals that much damage to each other planeswalker controlled by defending player and each other battle protected by defending player.

Up to two target lands you control become 1/1 black Bear creatures with deathtouch. They're still lands. (Then exile this card. You may cast the creature later from exile.)

Ward {2}
As long as you control six or more lands, Frondpond Errand-Runner gets +2/+0 and can't be blocked.

{U}{R}, {T}: Fulmen deals 1 damage to target creature. When a creature dealt damage this way dies this turn, draw a card.
Whenever you cast an instant or sorcery spell, if you cast another instant or sorcery spell this turn, exile Fulmen, then return him to the battlefield transformed under his owner's control. He deals 3 damage to each creature.

[+2]: Draw two cards, then discard two cards unless you discard an instant or sorcery card.
[–3]: Reveal any number of cards from your hand. Fulmen deals damage to any target equal to the number of instant and sorcery cards revealed.
[–9]: Search each player's library for up to one instant card and one sorcery card. Cast those cards without paying their mana costs. Then each player shuffles.

Whenever you cast a spell that targets, Fume Whisperer gets +1/+1 until end of turn and can't be blocked this turn.

Create a 5/5 green Badger Bear creature token with trample. (Then exile this card. You may cast the creature later from exile.)