It also gains you some life, which is a nice bonus that might even be relevant if youre playing a life gain strategy
Aristocrats decks are very popular in Commander, and this is an easy way to reanimate most of the key creatures for that archetype
Cards that are foretold by virtue of Singing Towers of Darillium's ability won't continue to have the foretell ability once they leave your hand, but you can still cast them from exile on a later turn for the foretell costs they were given by Singing Towers of Darillium
If you can build a deck to maximize it in regular Commander, as in cheese decks like Chulane, Teller of Tales or Clement, the Worrywort, thats the ticket to enjoying that late 90s life
While some crossovers, like the recent Jurassic World one releasing as a part of The Lost Caverns of Ixalan, are a part of core sets, a majority of the MTG universes beyond crossovers occur in Secret Lair product
I'd also consider Rest in Peace for Abhorrent Oculus decks as it shuts down Oculus, Haughty Djinn, and their Helping Hands