Spotlight's sac ability is good for creature board stalls.
Do they happen often enough in constructed to be worth it? (genuine question, by the way)
Depends on the matchup, and how the cards play out. Also confident there will be another 2 Midrange decks possible in the top tiers that will have very grindy board states, but GW and Jund already are a good example of a board state that can grind to a stop.
I'd say its worth it in some matchups as a 1-of. For what its worth, its 1-st pick limited.