Enchant creature
Enchanted creature gets +1/+1 and has "Whenever this creature deals combat damage to a player, investigate."

Enchant creature
Enchanted creature gets +1/+1 and has "Whenever this creature deals combat damage to a player, you may draw a card."
At the beginning of your end step, if you didn't attack with a creature this turn, sacrifice this Aura.

Enchant player
Whenever enchanted player casts an instant or sorcery spell, each other player may copy that spell and may choose new targets for the copy they control.

Enchant player
Whenever a player attacks enchanted player with one or more creatures, that attacking player may tap or untap target permanent of their choice.

Enchant player
At the beginning of enchanted player's upkeep, any number of target players other than that player each draw cards equal to the number of Curses attached to that player.

Enchant player
At the beginning of enchanted player's upkeep, that player mills two cards.

Enchant player
At the beginning of enchanted player's upkeep, that player reveals cards from the top of their library until they reveal a creature card. Put that card onto the battlefield under your control. That player puts the rest of the revealed cards into their graveyard.

Enchant player
Whenever enchanted player is attacked, you draw a card. Each opponent attacking that player does the same.

Whenever you cast a creature spell, you may pay . If you do, draw a card, then discard a card.

Creatures your opponents control get -1/-0.

When this enchantment enters, create a token that's a copy of target nontoken creature.
When this enchantment leaves the battlefield, exile the token.
When the token leaves the battlefield, sacrifice this enchantment.
At the beginning of your upkeep, sacrifice this enchantment unless you pay .

When this enchantment enters, exile all creatures you control. Then create that many 5/5 red Dragon creature tokens with flying.
When this enchantment leaves the battlefield, sacrifice all Dragons you control. Then return the exiled cards to the battlefield under your control.

As this enchantment enters, choose a card name.
: Counter target spell with the chosen name.

Whenever an opponent casts a spell, counter that spell and put a depletion counter on this enchantment. If there are three or more depletion counters on this enchantment, sacrifice it.
Cycling
When you cycle this card, you may counter target spell.

Enchant creature
Enchanted creature has base power and toughness 0/4, has defender, loses all other abilities, and is a blue Wall in addition to its other colors and types.

: Until end of turn, if you tap a land you control for mana, it produces instead of any other type.

Whenever one or more nontoken Merfolk you control become tapped, create a 1/1 blue Merfolk creature token with hexproof.

Whenever you cast a Merfolk spell, create a 1/1 blue Merfolk creature token with hexproof.

Enchant creature
Enchanted creature gets -1/+1.

Enchant creature
Enchanted creature doesn't untap during its controller's untap step.

When this enchantment enters, you gain 10 life.
When this enchantment leaves the battlefield, you lose 10 life.

Start your engines!
When this enchantment enters, create two 1/1 colorless Thopter artifact creature tokens with flying.
Max speed — Sacrifice this enchantment: Create two 1/1 colorless Thopter artifact creature tokens with flying

Flash
At the beginning of each player's draw step, that player draws an additional card.

Enchant creature
Shroud
Enchanted creature has shroud.

Enchant creature
: Return enchanted creature and this Aura to their owners' hands.

Each creature your opponents control is an Illusion in addition to its other types and has "When this creature becomes the target of a spell or ability, sacrifice it."

, Sacrifice a permanent: Return target permanent to its owner's hand.

Enchant artifact
Enchanted artifact has "At the beginning of your upkeep, sacrifice this artifact unless you pay its mana cost."

Whenever a permanent deals damage to you, return it to its owner's hand.

Flash
Enchant creature
When this Aura enters, each player mills two cards.
Enchanted creature gets -X/-0, where X is the number of cards in its controller's graveyard.