Lore Seeker

{3}{B}, Exile a permanent you control with a League of Dastardly Doom watermark: Return a permanent card with a League of Dastardly Doom watermark from your graveyard to the battlefield.

Whenever a creature an opponent controls becomes tapped, that creature doesn't untap during its controller's next untap step.

When you set this scheme in motion, until your next turn, whenever a player taps a land for mana, that player adds one mana of any type that land produced.

When you set this scheme in motion, look at the top six cards of your library. You may put a creature card from among them onto the battlefield. Put the rest on the bottom of your library in any order.

Target player puts the top three cards of their library into their graveyard.
Decipher {6}{U}

Counter target spell. If that spell is countered this way, put it on the bottom of its owner's library instead of into their graveyard.

Two target creatures you control gain indestructible until end of turn.

Exile target attacking creature. Then remove it from the game. Then put it into the absolutely-removed-from-the-freaking-game-forever zone.

As an additional cost to cast this spell, discard X cards.
Look at target opponent's hand and choose X cards from it. That player discards those cards.

Up to two target creatures each get +1/+0 and gain first strike until end of turn.
Madness {1}{R}

{T}: Each opponent puts the top card of their library into their graveyard.
{3}, {T}: Exile three target cards from an opponent's graveyard. Draw a card.

When Abandoned Bonfire enters the battlefield, you gain 2 life.
{T}: Add {C}.

Abandoned Excavation enters the battlefield with a charge counter on it.
{T}: Add {C}.
{T}, Remove a charge counter from Abandoned Excavation: Add one mana of any color.

Abandoned Outpost enters the battlefield tapped.
{T}: Add {W}.
{T}, Sacrifice Abandoned Outpost: Add one mana of any color.

First strike
Whenever a creature dealt damage by Abattoir Ghoul this turn dies, you gain life equal to that creature's toughness.

Frenzy 2
Whenever Abberrant Idealon becomes blocked, distribute two -1/-1 counters among one or two creatures defending player controls.

Flying, protection from red

Flying, vigilance

{W}, {T}: Abbey Matron gets +0/+3 until end of turn.

Enchant creature
When Abduction enters the battlefield, untap enchanted creature.
You control enchanted creature.
When enchanted creature dies, return that card to the battlefield under its owner's control.

Flying
At the beginning of your upkeep, mill a card. If an instant or sorcery card was milled this way, transform Aberrant Researcher.

As an additional cost to cast this spell, sacrifice a blue permanent.
Counter target spell.

Until end of turn, target creature gets +2/+0 and gains "When this creature dies, return it to the battlefield tapped under its owner's control."

You may discard a Plains card rather than pay this spell's mana cost.
Destroy target artifact or enchantment.

Trample
Abominable Treefolk's power and toughness are each equal to the number of snow permanents you control.
When Abominable Treefolk enters the battlefield, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step.