Ballista Watcher // Ballista Wielder 143/277

Oracle text

{2}{R}, {T}: This creature deals 1 damage to any target. Daybound (If a player casts no spells during their own turn, it becomes night next turn.) {2}{R}: This creature deals 1 damage to any target. A creature dealt damage this way can't block this turn. Nightbound (If a player casts at least two spells during their own turn, it becomes day next turn.)