Accursed Witch // Infectious Curse (SOI-097) - Shadows over Innistrad: (Double Faced Transform)

Spells your opponents cast that target Accursed Witch cost less to cast.
When Accursed Witch dies, return it to the battlefield transformed under your control attached to target opponent.

Enchant player
Spells you cast that target enchanted player cost less to cast.
At the beginning of enchanted player's upkeep, that player loses 1 life and you gain 1 life.