Weary Prisoner // Wrathful Jailbreaker (DBL-451) - Innistrad: Double Feature: (Double Faced Transform)

Defender
Daybound (If a player casts no spells during their own turn, it becomes night next turn.)

Wrathful Jailbreaker attacks each combat if able.
Nightbound (If a player casts at least two spells during their own turn, it becomes day next turn.)