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In the end, the day/night mechanic had a bunch of problems that sunk it: It was complicated, it was wordy, it required at times tracking something that didn't matter but could, etc

A fleck of dirt or something left in the case sliding down over time

With the pace at which new cards are revealed and released these days, more and more cards are getting lost in this shuffle

(It can block or be blocked by only creatures with shadow.) Flashback (You may cast this card from your graveyard for its flashback cost

Other times it would greatly improve your long game, taking away your opponents' most threatening cards and giving you lots of insight into what they were planning