Lore Seeker

Join Forces — Starting with you, each player may pay any amount of mana. Each player distributes X +1/+1 counters among any number of creatures they control, where X is the total amount of mana paid this way.

Join forces — Starting with you, each player may pay any amount of mana. Starting with the next opponent in turn order, each player gains control of a permanent of their choice with converted mana cost X or less, where X is the total amount of mana paid this way.

Flying, trample
Join forces — At the beginning of your upkeep, each player starting with you may pay any amount of mana. Each player loses 10 minus X life, where X is the total amount of mana paid this way.

Join forces — Starting with you, each player may pay any amount of mana. Each player exiles the top X cards of their library, where X is the total amount of mana spent this way. Each player may cast cards they exiled this way until the end of their next turn.

Join forces — Starting with you, each player may pay any amount of mana. Each player creates X 2/2 green Wolf creature tokens, where X is the total amount of mana paid this way.

Flash
Whenever an opponent is dealt 5 or more damage, each player other than that player draws a card.
Partner

If a source would deal damage to a creature other than Artorias, the Wolf Knight, you may have that damage be dealt to Artorias instead. If you do, you gain that much life.
Partner

At the beginning of your upkeep, put the top four cards of your library into your graveyard. Until end of turn, you may cast a noncreature card put into your graveyard this way.
Partner

Whenever a creature leaves the battlefield, put a +1/+1 counter on Black Iron Tarkus.
Remove two +1/+1 counters from Tarkus: It gains indestructible until end of turn.
Partner

Defender
At the beginning of combat on each player's turn, you may pay {2}. If you do, put a +1/+1 counter on target creature that player controls. That creature can't be blocked this turn.
Partner

Reach
Whenever a nontoken creature dies, you may pay 2 life. If you do, create a 1/2 green Spider creature token with reach.
Partner

Flying
If another source would deal damage to an opponent, it instead deals twice that much damage.
Partner

Lifelink
At the beginning of your end step, if a creature died this turn, scry 2.
Partner

Spells you cast that target creatures cost {2} less to cast.
Partner

Vigilance, haste
Whenever one or more creatures with power 2 or less block, Ornstein, Tester of Mortals deals 4 damage to each player.
Partner

Whenever a creature enters the battlefield under your control, each opponent loses 1 life and you gain 1 life.
Partner

Whenever Pinwheel, Masked Cabal attacks, you may discard a card. If you do, create two 2/2 blue Illusion creature tokens with "When this creature becomes the target of a spell, sacrifice it."
Partner

Whenever you cast a noncreature spell, put a +1/+1 counter on Priscilla, Cross-Breed. It gains lifelink and hexproof until end of turn.
Partner

Menace
Whenever Quelaag, Chaos Witch attacks, it deals damage equal to its power to an opponent chosen at random.
Partner

{T}: Add {R}{R}.
{T}, Exile two cards from your graveyard: Create a 2/2 red and green Shaman creature token with "{T}: Add {R}."
Partner

Whenever Sieglinde, Leal Daughter deals combat damage to a player, return target creature card with converted mana cost 2 or less from your graveyard to the battlefield.
Partner

At the beginning of combat on your turn, choose an opponent at random. Siegmeyer, Errant Ally attacks that player this combat if able. Whenever Siegmeyer deals combat damage to that player this turn, draw a card.
Partner

Vigilance
Equip abilities you activate cost {3} less to activate.
Partner

Menace
Smough, Grisly Executioner must be blocked by two or more creatures if able.
Partner

Whenever Solaire, Seeker of Sunlight and exactly one other creature attack, they each gain double strike until end of turn.
Partner