Lore Seeker

Whenever Abigail, Cawyer Station Chief enters the battlefield or one or more nontoken creatures you control deal combat damage to a player, create a 2/2 white Soldier creature token.
{R}, Sacrifice a token: Abigail, Cawyer Station Chief deals 1 damage to target creature. That creature can't block this turn.

Tap an untapped Cephalid you control: Tap target permanent.
{U}{U}{U}: Tap all creatures without flying.

First strike
{G}{W}, Tap two other untapped creatures you control: Until end of turn, Ace Holden gets +3/+3 and must be blocked if able.

Whenever you cast a spell with a squirrel in its art, you get {A} (an acorn counter).
Whenever a Squirrel you control enters the battlefield or dies, you get {A}.
{2}{B}, Pay X {A}: Target creature gets -X/-X until end of turn.
{G}, Pay X {A}: Target creature gets +X/+X until end of turn.

Adamaro, First to Desire's power and toughness are each equal to the number of cards in the hand of the opponent with the most cards in hand.

Flying
Whenever another creature enters the battlefield under your control, Adavene, Dean of the Arts deals 1 damage to each opponent.
Whenever a creature you control deals combat damage to a player, you may exile it, then return it to the battlefield.

Flying, haste
Whenever you cast an instant or sorcery spell, Wizards you control get +1/+1 until end of turn.

Other Pirates you control get +1/+1.
At the beginning of your end step, gain control of target nonland permanent controlled by a player who was dealt combat damage by three or more Pirates this turn.

Melee
Other creatures you control have melee.

{B}{R}{G}, {T}: Return target creature card from your graveyard to your hand.

Whenever Agrus Kos, Wojek Veteran attacks, attacking red creatures get +2/+0 and attacking white creatures get +0/+2 until end of turn.

{T}: Each player discards a card. Activate this ability only any time you could cast a sorcery.
Whenever you discard a card, you may exile three cards from your graveyard that share no card types. If you do, exile Aisha, then return her to the battlefield transformed under her owner's control.

As Aisha, Child Dreamer enters the battlefield, create Mr. Grumpy, a legendary 7/7 blue and red Elemental creature token with dreamwalk and trample.
When Aisha leaves the battlefield, exile all creatures you control named Mr. Grumpy.

Flying
Whenever you create one or more tokens for the first time each turn, create a 1/1 white Bird creature token with flying.
{3}{U}{R}{W}: Creature tokens you control gain double strike until end of turn.

First strike, vigilance
Akiri, Line-Slinger gets +1/+0 for each artifact you control.
Partner

This spell can't be countered.
Flying, trample, protection from white and from blue
{R}: Akroma, Angel of Fury gets +1/+0 until end of turn.
Morph {3}{R}{R}{R}

Flying, first strike, vigilance, trample, haste, protection from black and from red

Haste
At the beginning of your upkeep, if you have more cards in hand than each opponent, you may sacrifice a Swamp. If you do, return Akuta, Born of Ash from your graveyard to the battlefield.

Whenever you cast a spell, put the top three cards of your library into your graveyard.
At the beginning of the end step on each opponent's turn, if your library has fifteen or fewer cards in it, take an extra turn after this one.

Flying, deathtouch, lifelink
Other creatures you control with flying get +1/+0.
Whenever you cast an artifact or enchantment spell, create a 1/1 blue Faerie creature token with flying.

First strike
Whenever Alesha, Who Smiles at Death attacks, you may pay {W/B}{W/B}. If you do, return target creature card with power 2 or less from your graveyard to the battlefield tapped and attacking.

Whenever you cast a wordy spell, scry 2. (A spell is wordy if it has four or more lines of rules text.)
{1}{R}, {T}: Choose target creature you don't control. Reveal the top card of your library. Alexander Clamilton gets +X/+0 until end of turn, where X is the number of lines of rules text on the revealed card. Alexander Clamilton fights that creature.

{X}{U}, {T}, Discard two cards: Return X target creatures to their owners' hands.

Flying
As Alhammarret, High Arbiter enters the battlefield, each opponent reveals their hand. You choose the name of a nonland card revealed this way.
Your opponents can't cast spells with the chosen name.

Alirios, Enraptured enters the battlefield tapped.
Alirios doesn't untap during your untap step if you control a Reflection.
When Alirios enters the battlefield, create a 3/2 blue Reflection creature token.