As Favored Enemy enters the battlefield, note the most prevalent creature type in an opponent's library.

When Favored Enemy enters the battlefield, target creature you control fights up to one target creature you don't control.

Whenever a creature an opponent controls of the noted type dies, put a +1/+1 counter on target creature you control.

Constellation — Whenever an enchantment you control enters, Favored of Iroas gains double strike until end of turn.

Enchant creature

When Fealty to the Realm enters, you become the monarch.

The monarch controls enchanted creature.

Enchanted creature attacks each combat if able and can't attack you.

As an additional cost to cast this spell, exile a creature you control.

Flying

When Fear of Abduction enters, exile target creature an opponent controls.

When Fear of Abduction leaves the battlefield, put each card exiled with it into its owner's hand.

When Fear of Burning Alive enters, it deals 4 damage to each opponent.

Delirium — Whenever a source you control deals noncombat damage to an opponent, if there are four or more card types among cards in your graveyard, Fear of Burning Alive deals that amount of damage to target creature that player controls.

As an additional cost to cast this spell, tap two untapped creatures and/or lands you control.

Trample

Flying

Whenever Fear of Falling attacks, target creature defending player controls gets -2/-0 and loses flying until your next turn.

Flash

When Fear of Impostors enters, counter target spell. Its controller manifests dread. (That player looks at the top two cards of their library, then puts one onto the battlefield face down as a 2/2 creature and the other into their graveyard. If it's a creature card, it can be turned face up any time for its mana cost.)

As an additional cost to cast this spell, return a permanent you control to its owner's hand.

Flying

When Fear of Missing Out enters, discard a card, then draw a card.

Delirium — Whenever Fear of Missing Out attacks for the first time each turn, if there are four or more card types among cards in your graveyard, untap target creature. After this phase, there is an additional combat phase.

Vigilance

Whenever Fear of Surveillance attacks, surveil 1. (Look at the top card of your library. You may put it into your graveyard.)

Damage can't be prevented this turn. Fear, Fire, Foes deals X damage to target creature and 1 damage to each other creature with the same controller.

Landfall — Whenever a land you control enters, put a +1/+1 counter on Fearless Fledgling. It gains flying until end of turn.

Boast — : Create a 2/1 red Dwarf Berserker creature token. (Activate only if this creature attacked this turn and only once each turn.)

Backup 1 (When this creature enters, put a +1/+1 counter on target creature. If that's another creature, it gains the following ability until end of turn.)

Double strike

Enchant creature

Enchanted creature gets +2/+2 and has ": Target creature can't block this creature this turn."

Flying

At the beginning of your end step, each Dragon card in your hand perpetually gains "This spell costs less to cast."

Enchant creature

Enchanted creature gets +4/+0.

Destroy target land. If that land was legendary, its controller sacrifices another land.

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color.)

Flying

Devour 2 (As this enters, you may sacrifice any number of creatures. This creature enters with twice that many +1/+1 counters on it.)

Put a +1/+1 counter on target creature you control. It gains protection from the color of your choice until end of turn. (It can't be blocked, targeted, dealt damage, enchanted, or equipped by anything of that color.)

Flying, lifelink

Whenever you cast a noncreature spell that targets only Feather, Radiant Arbiter, you may choose any number of other creatures that spell could target and pay for each of those creatures. If you do, for each of those creatures, copy that spell. The copy targets that creature. (Copies of permanent spells become tokens.)

Reach

As long as you control ten or more lands, creatures you control get +2/+2.

Whenever Fecund Greenshell or another creature you control with toughness greater than its power enters, look at the top card of your library. If it's a land card, you may put it onto the battlefield tapped. Otherwise, put it into your hand.

Exile target creature or planeswalker.

Target creature gets -X/-X until end of turn, where X is the number of Zombies on the battlefield.

When this creature enters, roll a six-sided die. This creature deals damage equal to the result to target creature an opponent controls.

Haste

Feldon, Ronom Excavator can't block.

Whenever Feldon is dealt damage, exile that many cards from the top of your library. Choose one of them. Until the end of your next turn, you may play that card.

Inspired — Whenever Felhide Spiritbinder becomes untapped, you may pay . If you do, create a token that's a copy of another target creature, except it's an enchantment in addition to its other types. It gains haste. Exile it at the beginning of the next end step.

When Felidar Guardian enters, you may exile another target permanent you control, then return that card to the battlefield under its owner's control.

Vigilance, lifelink

At the beginning of your upkeep, if you have 40 or more life, you win the game.

Other Cats you control get +1/+1 and have protection from Dogs.

Whenever one or more Cats you control deal combat damage to a player, destroy up to one target artifact or enchantment that player controls.

Flying

Devour 1 (As this enters, you may sacrifice any number of creatures. This creature enters with that many +1/+1 counters on it.)

Whenever Fell Beast of Mordor enters or attacks, target opponent loses X life and you gain X life, where X is the number of +1/+1 counters on it.

When Fell Horseman dies, put it on the bottom of its owner's library.

Whenever Fell Shepherd deals combat damage to a player, you may return to your hand all creature cards that were put into your graveyard from the battlefield this turn.

, Sacrifice another creature: Target creature gets -2/-2 until end of turn.

Deathtouch

Exploit (When this creature enters, you may sacrifice a creature.)

When Fell Stinger exploits a creature, target player draws two cards and loses 2 life.

: Add one mana of any color that a land an opponent controls could produce.

: Femeref Archers deals 4 damage to target attacking creature with flying.

: Prevent the next 1 damage that would be dealt to any target this turn.

Fen Stalker has fear as long as you control no untapped lands. (It can't be blocked except by artifact creatures and/or black creatures.)

Enchant creature

Creatures you control that are enchanted get +1/+1 and have first strike.

Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)

Put a +1/+1 counter on target creature you control. Another target creature blocks it this turn if able.

Look at the top five cards of your library. You may exile a creature card from among them. Put the rest on the bottom of your library in a random order. You may cast the exiled card this turn. At the beginning of the next combat phase this turn, target creature you control deals damage equal to its power to up to one target creature you don't control.

Feral Hydra enters with X +1/+1 counters on it.

: Put a +1/+1 counter on Feral Hydra. Any player may activate this ability.

Target creature gets +1/+1 until end of turn.

Draw a card at the beginning of the next turn's upkeep.

Trample

: Feral Ridgewolf gets +2/+0 until end of turn.