Component Collector

Most day-and-night payoffs are passive: they trigger, they scale, they wait for the cycle to turn on its own. This one grabs the wheel. The tap-or-untap trigger fires whether the board is turning to day or to night, and because it targets any nonland permanent, it is equally a tempo tool (tapping down a blocker before a swing, or an attacker before combat) and an untap engine (freeing a mana rock, resetting a creature with a tap ability, or standing up a spent attacker so it can ambush as a surprise blocker). The 1/4 body is built to survive on defense while the trigger does the real work, turn after turn, as long as the pendulum keeps moving. The entry clause carries more than it looks: forcing daytime when neither state is active means the mechanic can be switched on from a cold board, which is what lets a deck lean on the transition rather than hope an opponent's card sets it up. What makes the design cohere is that the two halves feed each other. You want the cycle to flip as often as possible, and each flip hands you a free tap effect, so the incentive to churn the clock and the reward for churning it live on the same card. It is a modest rate on a defensive frame, but it turns a mechanic that usually happens to a player into one a player operates.