Mistform Mask

Enchantment — Aura

Enchant creature
: Enchanted creature becomes the creature type of your choice until end of turn.

Mists of Littjara

Enchantment — Aura

Flash
Enchant creature or Vehicle
Enchanted creature gets -3/-0.

Mystic Decree

World Enchantment

All creatures lose flying and islandwalk.

Mystic Restraints

Enchantment — Aura

Flash
Enchant creature
When Mystic Restraints enters the battlefield, tap enchanted creature.
Enchanted creature doesn't untap during its controller's untap step.

Mystic Subdual

Enchantment — Aura

Flash
Enchant creature
Enchanted creature gets -2/-0 and loses all abilities. (Mutating onto the creature won't give it new abilities. It can gain abilities in other ways.)

Narcolepsy

Enchantment — Aura

Enchant creature
At the beginning of each upkeep, if enchanted creature is untapped, tap it.

Navigator's Ruin

Enchantment

Raid — At the beginning of your end step, if you attacked this turn, target opponent mills four cards.

Now I Know My ABC's

Enchantment

At the beginning of your upkeep, if you control permanents with names that include all twenty-six letters of the English alphabet, you win the game.

Nyxborn Seaguard

Enchantment Creature — Merfolk Soldier (2/5)

Oath of Jace

Legendary Enchantment

When Oath of Jace enters the battlefield, draw three cards, then discard two cards.
At the beginning of your upkeep, scry X, where X is the number of planeswalkers you control.

Oath of Scholars

Enchantment

At the beginning of each player's upkeep, that player chooses target player who has more cards in hand than they do and is their opponent. The first player may discard their hand and draw three cards.

Ocular Halo

Enchantment — Aura

Enchant creature
Enchanted creature has ": Draw a card."
: Enchanted creature gains vigilance until end of turn.

Ojer Pakpatiq, Deepest Epoch // Temple of Cyclical Time

Legendary Creature — God // Land (4/3)

Flying
Whenever you cast an instant spell from your hand, it gains rebound. (Exile it as it resolves. At the beginning of your next upkeep, you may cast it from exile without paying its mana cost.)
When Ojer Pakpatiq dies, return it to the battlefield tapped and transformed under its owner's control with three time counters on it.

Temple of Cyclical Time

(Transforms from Ojer Pakpatiq, Deepest Epoch.)
: Add . Remove a time counter from Temple of Cyclical Time.
, : Transform Temple of Cyclical Time. Activate only if it has no time counters on it and only as a sorcery.

Omen of the Sea

Enchantment

Flash
When Omen of the Sea enters the battlefield, scry 2, then draw a card.
, Sacrifice Omen of the Sea: Scry 2.

One with the Stars

Enchantment — Aura

Enchant creature or enchantment
Enchanted permanent is an enchantment and loses all other card types. (It still has its abilities, but it's no longer a creature.)

One With the Wind

Enchantment — Aura

Enchant creature
Enchanted creature gets +2/+2 and has flying.

Opposition

Enchantment

Tap an untapped creature you control: Tap target artifact, creature, or land.

Oracle's Insight

Enchantment — Aura

Enchant creature
Enchanted creature has ": Scry 1, then draw a card." (To scry 1, look at the top card of your library, then you may put that card on the bottom of your library.)

Paradox Haze

Enchantment — Aura

Enchant player
At the beginning of enchanted player's first upkeep each turn, that player gets an additional upkeep step after this step.

Parallax Tide

Enchantment

Fading 5 (This enchantment enters the battlefield with five fade counters on it. At the beginning of your upkeep, remove a fade counter from it. If you can't, sacrifice it.)
Remove a fade counter from Parallax Tide: Exile target land.
When Parallax Tide leaves the battlefield, each player returns to the battlefield all cards they own exiled with Parallax Tide.