Lore Seeker

At the beginning of your upkeep, you may say "Ach! Hans, run! It's the . . ." and the name of a creature card. If you do, search your library for a card with that name, put it onto the battlefield, then shuffle your library. That creature gains haste. Exile it at the beginning of the next end step.

{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.

Cannot be the target of spells or effects. World Champion has power and toughness equal to the life total of target opponent.
{0}: Discard your hand to search your library for 1996 World Champion and reveal it to all players. Shuffle your library and put 1996 World Champion on top of it. Use this ability only at the beginning of your upkeep, and only if 1996 World Champion is in your library.

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

Spells and abilities you control can't destroy, exile, target, or cause you to sacrifice A Good Thing.
At the beginning of your upkeep, double your life total. Then, if you have 1,000 or more life, you lose the game.

Whenever a face-down creature you control deals combat damage to an opponent, you may exile it, then cast it without paying its mana cost.
{2}{R}{R}: Put a card from your hand onto the battlefield face down.

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.

You may cast spells that have a cycling ability from your graveyard.
If a card that has a cycling ability would be put into your graveyard from anywhere and it wasn't cycled, exile it instead.

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.

Prowess
When Abbot of Keral Keep enters the battlefield, exile the top card of your library. Until end of turn, you may play that card.

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.

Until end of turn, target player can't cast instant or sorcery spells, and that player can't activate abilities that aren't mana abilities.
Draw a card.