I'm just getting back into legacy after a 4 year break and I don't have many resources at the moment, so I wanted to know: how essential is Chalice of the Void in the sideboard? I've noticed every build I've seen of Turbo Depths runs it, but I'm not sure exactly what it's there for. What matchups is it used in? And how much of an upside is it to play it on 1 while we run so many 1 cmc spells ourselves?