Of course, it's not legal anywhere, though it works completely within black-border rules, so maybe a Rule 0 conversation can get you there

Daybound/Nightbound Card Gallery and List Arlinn, the Pack's Hope / Arlinn, the Moon's Fury Baneblade Scoundrel / Baneclaw Marauder Bird Admirer / Wing Shredder Brutal Cathar / Moonrage Brute Burly Breaker / Dire-Strain Demolisher Curse of Leeches / Leeching Lurker Fangblade Brigand / Fangblade Eviscerator Graveyard Trespasser / Graveyard Glutton Harvesttide Infiltrator / Harvesttide Assailant Hound Tamer / Untamed Pup Kessig Naturalist / Lord of the Ulvenwald Outland Liberator / Frenzied Trapbreaker Reckless Stormseeker / Storm-Charged Slasher Shady Traveler / Stalking Predator Spellrune Painter / Spellrune Howler Suspicious Stowaway / Seafaring Werewolf Tavern Ruffian / Tavern Smasher Tireless Hauler / Dire-Strain Brawler Tovolar, Dire Overlord / Tovolar, the Midnight Scourge Tovolar's Huntmaster / Tovolar's Packleader Village Watch / Village Reavers Other Cards That Interact With Day/Night: Angel of Eternal Dawn Celestus Sanctifier Gavony Dawnguard Component Collector Firmament Sage Brimstone Vandal Obsessive Astronomer Olivia's Midnight Ambush Moonrager's Slash Sunstreak Phoenix Sunrise Cavalier Unnatural Moonrise Vadrik, Astral Archmage The Celestus So You Wanna Play Werewolves

Another big problem is that the deck is divided between cards that work well with either Sauron or Saruman
I dont think anyone will want to skip their next untap step more than once if they can help it
I have no idea what the Shrines are doing in a set aimed at Legacy
And we havent had one that does quite this ability before