Curse of Leeches // Leeching Lurker

Curse of LeechesEnchantment — 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.)

Leeching LurkerCreature — Leech Horror

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