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Whats more, the Regent actually gets bigger if you keep delving your spells

For example, Tovolar, Dire Overlord (visible in the gallery above) will make it night if you control three or more wolves/werewolves at the start of your turn, and even has an extra ability specifically meant to allow past werewolves that don't automatically change with Daybound or Nightbound to transform along with it

And that's before we even go looking for cards that break it like the nameless Elvish Archdruid or Gilt-Leaf Archdruid

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In this sense, I think Opt is much closer to Think Twice than it is to Sleight of Hand