Curse of Leeches

Magic the Gathering mana symbolMagic the Gathering mana symbol
Enchantment — Aura Curse

Enchant player

As this permanent transforms into Curse of Leeches, attach it to a player.

At the beginning of enchanted player's upkeep, they lose 1 life and you gain 1 life.

Daybound

Leeching Lurker

Magic the Gathering mana symbolCreature — Leech Horror

[[ keyword: "Lifelink" ]]

Nightbound

qUriah Voth
standard
Not Legal
alchemy
Not Legal
pioneer
Legal
explorer
Legal
modern
Legal
historic
Legal
standard brawl
Not Legal
historic brawl
Legal
timeless
Legal

Rulings

If it is night, permanents with daybound that enter the battlefield without being cast will enter with their nightbound faces up.
(wotc2021-09-24)
If it's neither day nor night, and a creature with daybound and a creature with nightbound somehow appear on the battlefield at the same time, it becomes day. The creature with nightbound will transform.
(wotc2021-09-24)
If it is night, and the active player of the previous turn cast two or more spells during their turn, it becomes day.
(wotc2021-09-24)
Permanents with daybound and nightbound can't transform via any means other than their daybound and nightbound abilities. Notably, older cards such as Moonmist that instruct a player to transform permanents don't affect permanents with daybound or nightbound.
(wotc2021-09-24)
Attaching Curse of Leeches as it transforms doesn't target a player, so it can be attached to a player with hexproof this way.
(wotc2021-09-24)
Day and night are designations that the game itself can have. The game starts as neither. Once the game becomes day (or less commonly, night), the game will be exactly one of them—day or night—going back and forth for the rest of the game.
(wotc2021-09-24)
If you cast Curse of Leeches while it is night, you must still choose a target player, and that player must be a legal target as Curse of Leeches resolves. It enters the battlefield transformed and is not attached to that player.
(wotc2021-09-24)
After Curse of Leeches transforms into Leeching Lurker, it will become unattached from the player it's attached to as a state-based action.
(wotc2021-09-24)
If you cast a spell with daybound during night, that spell will be front face up (that is, daybound face up) on the stack. However, it will enter the battlefield with its back face up (that is, with its nightbound face up). It won't enter with its daybound face up and then transform.
(wotc2021-09-24)
If it is day, and the active player of the previous turn cast no spells during their turn, it becomes night.
(wotc2021-09-24)
Double-faced permanents with daybound transform to their nightbound faces as it becomes night. Similarly, double-faced permanents with nightbound transform to their daybound faces as it becomes day. This happens immediately and is not a state-based action. It happens any time it becomes day or night, not just during the untap step.
(wotc2021-09-24)
Before a player untaps their permanents during the untap step, the game checks to see if the day/night designation should change.
(wotc2021-09-24)
If Leeching Lurker is on the battlefield during night, and the active player casts two or more spells during the turn, it will become day as the next turn begins. This will cause Leeching Lurker to transform into Curse of Leeches and become attached to a player. This all happens before that turn's upkeep, so the triggered ability of Curse of Leeches will trigger at the beginning of that turn's upkeep.
(wotc2021-09-24)
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