Totality (Entirely / Nothing Beats)
2 related grammar points that express the same core idea - compared below so you can tell which one to reach for.
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ずくめ / に限る
Recommending something as the best there is.
Noun に限る vs Noun ずくめ: Use に限る: 夏はビールに限る. It is a recommendation, not a description. ずくめ describes a state made up entirely of one thing (いいことずくめ), so it reports rather than advises.