i don't think siren is actually played anywhere, ranked or unranked, because it's almost unplayable. winning is a matter of chance and even if its current mechanics werent so broken (dies even when picking its killer right?) it still depends on having prs, hiding its identity, and somehow making not one but two people visit it without gaining suspicion
instead of making siren guess who visits her, just give her two chances to predict whether she's visited at all. this is still difficult, but it's actually feasible
make it happen lucid