At the beginning of your end step, if a creature died this turn, exile the top card of your library. Until the end of your next turn, you may play that card.

Fortress Arena enters tapped.
{T}: Add {R} or {W}.
{2}{R}{W}, {T}, Sacrifice Fortress Arena: Draw a card.

{T}: Add {C}. You may sacrifice Fortune Bearer. If you don't, you can't spend this mana to cast a spell from your hand.
Surface {5}{U}{U}. Fortune Bearer surfaces transformed.

Flying
If a source would deal 2 or more damage to Fragile Soul, prevent that damage.

Whenever you amp it up, Fraying Gearhead gets +1/+0 and gains first strike until end of turn.

When Free Market enters, target creature gets +2/+2 until end of turn.
You control a creature with power 4 or greater.
You control a creature with toughness 4 or greater.

Whenever Freightyard Scrappers attacks, create a Treasure token.
{X}, Sacrifice an artifact: Return target artifact card with mana value X or less from your graveyard to the battlefield. Activate only as a sorcery and only once each turn.

Create three Berry tokens, then sacrifice any number of Berries. For each Berry sacrificed this way, creatures you control get +1/+1 until end of turn.

Flying
{VP}{VP}{VP}: Frequency Faeries gets +2/-2 until end of turn.

Frequency Jolt deals 5 damage to target creature, then it deals 2 damage to that creature's controller for each time you've amped it up this turn.

{VP}{VP}{VP}: Put a +1/+1 counter on Frequency Omnivore.

Whenever you amp it up, put a +1/+1 counter on Fresh-Faced Idol.

Frigid Highlands enters tapped unless you control an Island.
{T}: Add {R} or {G}.

{1}{B}, Exile two permanent cards from your graveyard: Choose one —
• Create two 1/1 green Saproling creature tokens.
• Exile the top card of target opponent's library. You may play that card for as long as it remains exiled, and mana of any type can be spent to cast it.

Deathtouch, lifelink
When Furies of the Natural Order enters, bless any number of target players.

Target creature you control gains double strike until end of turn. It deals damage equal to its power to each of up to two other targets.

Enchant creature
Enchanted creature attacks each combat if able.
Whenever enchanted creature attacks, teach it trample.

Flash
Deathtouch
Whenever you cast a noncreature spell, return up to one target creature card from your graveyard to your hand.

Put a +1/+1 counter on target creature, then it gets your choice of +1/+1 or lifelink until end of turn.

As an additional cost to cast instant and sorcery spells, you may pay {X}, where X is that spell's mana value. If you do, copy that spell, and you may choose new targets for the copy.
Spellcharge 4

{T}: Add {C}.
{T}: Add one mana of any color. Spend this mana only to cast Shrine spells or activate abilities of Shrines.

[+1]: Discard up to two cards, then draw that many cards.
[–1]: You may sacrifice a creature. When you do, return target creature card with equal or lesser mana value from your graveyard to the battlefield tapped.
[–2]: You may exile a creature card from your graveyard. When you do, Garren deals damage equal to the exiled creature's power to target creature.

Gates to the Underworld enters tapped.
{T}: Add {W} or {B}.
{5}{W/B}: Gates to the Underworld becomes a 3/4 white and black Construct creature with lifelink until end of turn. It's still a land. This ability costs {X} less to activate, where X is your devotion to white and black. Activate only once each turn.

Whenever you sacrifice a nonland permanent, each opponent sacrifices a permanent that shares a card type with it.
{3}, {T}, Sacrifice another creature: Gatherer of Grievances deals damage equal to the sacrificed creature's power to target player. Activate only as a sorcery.