Curse of Leeches // Leeching Lurker

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.)

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