msem-instigator

Glitch {2} (Remove one [restriction] for each time you pay the glitch cost.)
Tap up to two target creatures [with the same name]. Those creatures don't untap during their controller's next untap step.

Creatures you don't control get -3/-0 until end of turn. Those creatures don't untap during their controller's next untap step.

Flying
Whenever Frenzied Sylph attacks or blocks, you may pay {R}. If you do, it gets +3/+0 until end of turn. Exile it at the beginning of the next end step.

When Fretport Bounty Hunter enters, scry 1.

{2}{U}: Each player mills three cards.
{3}{B}, Discard a card: Return target creature card from your graveyard to your hand. Proliferate. (Choose any number of permanents and/or players with counters on them, then give each another counter of each kind already there.)

Defender
When Friend of Tides enters, rouse 2. (Distribute two +1/+1 counters among permanents you control. If they aren't creatures, tap them and they become 0/0 creatures in addition to their other types.)

Whenever a creature an opponent controls deals damage to you, monstrosity 2. (If this creature isn't monstrous, put two +1/+1 counters on it and it becomes monstrous.)
Frigid Behemoth can't attack unless it's monstrous.

Tap up to one target nonland permanent and put a stun counter on it.
Compose (Then if you cast this from your hand, exile it and create a Saga token with “r3—You may cast a copy of this card from exile without paying its mana cost.”)

You may reveal a Revelation card you own from outside the game or choose a face-up Revelation card you own in exile. Put that card into your hand. Exile From Stars Above.

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

Frondpond Prankster can't be blocked.
Whenever Frondpond Prankster enters or deals combat damage to a player, target player reveals their hand, then you choose any number of nonland cards from it. That player puts those cards on the bottom of their library in a random order, then draws that many cards.

Flying
{T}: Add {C}. Spend this mana only to cast spells or activate abilities during an opponent's turn.

When Frost Walker becomes the target of a spell or ability, sacrifice it.

Flying
Artifact spells you cast cost {1} less to cast.

Flying
This spell can't be countered.
When Frostbreath Dragon enters, tap target creature. It doesn't untap during its controller's next untap step.
Whenever Frostbreath Dragon becomes the target of a spell or ability, counter it unless its controller pays {2} and discards a card.

Deception {2}{U} ({2}{U}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)
Whenever Frostclaw Shinobi deals combat damage to a player, scry 1, then draw a card.

Enchant creature
Enchanted creature can't become untapped.
{4}{U}: Return Frozen Halo and enchanted creature to their owners' hands.

This spell costs {4} less to cast if a player attacked with four or more creatures this turn.
End the turn.

Put target creature on the bottom of its owner's library. That player reveals cards from the top of their library until they reveal a creature card, then puts all cards revealed this way into their graveyard.

Choose one —
• Return all tapped creatures to their owners' hands.
• Return all untapped creatures to their owners' hands.

Flash
Flying
When Gale Conjurant enters, return target spell to its owner's hand if its mana value is less than or equal to the number of creatures in Gale Conjurant's pack. (Two or more creatures you control with equal power are in a pack.)

Flying
If a triggered ability of another permanent you control would trigger for the first time each turn, that ability triggers an additional time.

Return target creature to its owner's hand. You may have another target creature gain flying until end of turn.

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

(Transform this if it's not attached to a creature. Pay {3}{U} as a sorcery to unattach it.)
Enchant creature you control
Gamhaugen Warbeast's rider gets +2/+2 and has flying.