msem-instigator

Flying
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)

Whenever Firefall Praetorians attacks, exile the top card of your library then copy it. You may play the copy and/or the exiled card.

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

Bleed {1}{U}{U} (You may cast this spell for its bleed cost if an opponent has lost life this turn.)
Look at the top seven cards of your library. Put two of those cards into your hand and the rest on the bottom of your library in any order.

Menace
Whenever Flayed Dunerazer attacks or blocks, sacrifice a permanent.

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

Flash
{6}: Target creature gains flying until end of turn.

Return all creatures with toughness 3 or less to their owners' hands.
Investigate three times. (To investigate, create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”)

Until the end of your next turn, you may play a red card you own from outside the game. Add {R}{R}.

Font of Sorrows and other permanents you control entering the battlefield cause their death knell to trigger.
Death knell — Draw a card. (As a creature you control dies, trigger one death knell of that creature or another permanent you control.)

Return target instant or sorcery card from your graveyard to your hand. Forbidden Wisdom deals damage to up to one target creature or planeswalker equal to that card's mana value.
Exile Forbidden Wisdom.

{W}, Exile Foretold Cataclysm from your hand: Exile target creature you control until the end of your next turn. You may cast Foretold Cataclysm from exile during your next turn. Activate only as a sorcery.
Destroy all creatures.

For each creature you don't control, create a token that's a copy of that creature.
Destroy all creatures.

When Forlorned Knight enters, you may sacrifice another creature. If you do, create two 1/1 white Human creature tokens.
Whenever you attack, if another creature died under your control this turn, creatures you control get +1/+1 until end of turn.
Fleeting {W}{B} (You may cast this spell for its fleeting cost. If you do, sacrifice it at the beginning of the next end step.)

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.

Flying, vigilance
When Formless Eidolon enters, create a tapped token that's a copy of target land you control.
Evoke {3} (You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters.)

Each player discards their hand. Draw up to two hands of seven cards. Shuffle all but one of your hands into your library. Each other player draws seven cards.

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

Whenever a -1/-1 counter is put on a creature, you may create a 1/2 green Frog creature token.

When From Peace and Purpose enters, exile all creatures until From Peace and Purpose leaves the battlefield.
At the beginning of your upkeep, investigate. (Create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”)

At the beginning of your end step, untap all lands you control. You may put three +1/+1 counters on target land you control. If you do, that land becomes a 0/0 Treefolk creature with haste that's still a land.

Vigilance
Warriors you control have ward {X}, where X is the number of Warriors you control. (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays {X}.)

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.

First strike

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.