Firmament Sage

Most cards that care about the diurnal cycle reward you passively for whichever half you happen to sit in: a static buff by day, a different one by night. This wizard ignores the state entirely and taxes the transition. Every flip of the meter, in either direction, is a card. That reframing changes what the mechanic is worth. Day becomes night when the active player casts no spells during their turn, and night becomes day when a player casts two or more spells in a turn, so a deck built to see-saw deliberately (holding spells to force night, then unloading to force day back) converts each swing into a draw, and the 2/3 body survives long enough to bank several. The enters clause does work that is easy to overlook: dropping this into a game that has never touched the day/night state sets the meter to day rather than leaving it dormant, priming the next transition instead of stalling with nothing to flip. It turns a mechanic that many decks treat as ambient weather into an actual resource loop, though only for a build willing to police its own casting rhythm to keep the pendulum moving. Outside that kind of intentional engine, it is a modest Human Wizard that draws the occasional card when the daylight happens to change; the ceiling lives entirely in how hard you are willing to work the cycle.