msem-instigator

At the beginning of your upkeep, reveal the top card of your library. If you reveal a creature card this way, put it into your hand.

Haste
Erratic (When this creature dies, reveal the top four cards of your library. Put a creature card that costs less than this revealed this way onto the battlefield and the rest on the bottom of your library in any order.)

First strike
Sacrifice Fearless General: Soldiers you control gain indestructible until end of turn.

When Fearless King Shabil enters, reveal the top five cards of your library. You may put a Cat card from among them into your hand. Put the rest on the bottom of your library in any order.
At the beginning of combat on your turn, each Cat you control gains all abilities of each other Cat you control until end of turn.

When Fearless Realmwalker enters, put a +1/+1 counter on each of up to two target creatures.
Whenever Fearless Realmwalker attacks, you may pay {2}{W}. If you do, aetherize it. (To aetherize, create a token that's a copy of it, then exile that token.)

When Fearless Recruit dies, create a 1/1 white Rebel creature token.

Battalion — Whenever Fearsome Army and at least two other creatures attack, creatures you control gain menace until end of turn.

This spell can't be countered.
Ward {3}
{W}, Exile Fearsome Xenoblossom from your graveyard: You gain 4 life.

Wu Xing (Add effects based on the number of colors of mana spent to cast this spell.)
1 | Mill five cards. An opponent separates the milled cards into two piles. Put one pile into your hand.
5 | You may cast a nonland card from the other pile without paying its mana cost.

Reach
Once each turn, when a creature you control dies, you may draw a card.

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.

When Feathered Dancer enters, up to three target creatures can't block this turn.

Whenever you draw your second card each turn, draw a card.

Whenever you cast a spell that doesn't share a color with Feathered Warden, you may gain 1 life.

When Featherfall Ascetic enters, create a 1/1 white and blue Bird creature token with flying.
Whenever a nontoken Aura enters enchanting Featherfall Ascetic, for each other creature you control, you may create a token that's a copy of that Aura enchanting that creature.

Flying, first strike, lifelink

Return target spell or creature to its owner's hand. If you controlled that spell or creature, catalyze. (The next spell you cast this turn costs {1} less to cast.)

Create a 3/2 colorless Horror creature token. All other creatures get -3/-3 until end of turn.

Put a +1/+1 counter on target creature, then you gain 1 life for each +1/+1 counter among creatures you control.

Each player sacrifices a creature. Create a tapped 2/2 black Zombie creature token.

Feed to the Pigs deals X damage to any target. You gain X life.

Whenever an attacking creature dies, you may pay {R}. If you do, create a 2/1 red Merfolk creature token.

Draw cards equal to the number of cards in your hand, then discard three cards.
Cycling {U} ({U}, Discard this card: Draw a card.)

Flying
At the beginning of your upkeep, create an Idol token. (It's an artifact with “{1}, Sacrifice this artifact: Put a +1/+1 counter on target creature. Activate only as a sorcery.”)

When Fel Alston, Halfway Queen enters, return target creature card from your graveyard to the battlefield. Then exile that creature unless Fel Alston was cast for its escape cost.
Escape—{1}{W}{U}{B}, Sacrifice two creatures. (You may cast this card from your graveyard for its escape cost.)