2bEnchantment — 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 (If a player casts no spells during their own turn, it becomes night next turn.)

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Leeching Lurker

Enchantment — Aura Curse (4/4)

Lifelink

Nightbound (If a player casts at least two spells during their own turn, it becomes day next turn.)

First darkness falls. Then it burrows in.