Lore Seeker

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.

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

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.

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.

{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.

Machinate — {T}, Tap another untapped artifact you control: Target player draws a card.

{3}: Target player puts the top three cards of their library into their graveyard.

[+1]: Draw a card, then put a card from your hand on top of your library.
[–1]: Exile another target permanent you own, then return it to the battlefield under your control.
[–6]: Choose left or right. Each player gains control of all nonland permanents other than Aminatou, the Fateshifter controlled by the next player in the chosen direction.
Aminatou, the Fateshifter can be your commander.

Whenever another nontoken creature enters the battlefield under your control, bolster 1.

Whenever Anafenza, the Foremost attacks, put a +1/+1 counter on another target tapped creature you control.
If a nontoken creature an opponent owns would die or a creature card not on the battlefield would be put into an opponent's graveyard, exile that card instead.

Structures you control have hexproof.
Whenever you secure a Structure, choose one —
• Tap or untap target nonland permanent.
• Create a 1/1 white and blue Elemental Hound creature token.