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I dont think they are particularly rare, but I personally havent seen them before

Deck List NekrozDeck List Nekroz Impcantation Deck and Deck Instructions "Nekroz Impcantation" Deck 2019 Deck Introduction/Deck Commentary Related deck "Nekroz" Other Deck List 2022-03-18 Lawn mowing reasoning Nekroz 2021-12-04 sea 2021-12-01 Nekroz from Ocean Dragon Lord 2021-11-22 Banned Little Ritual Specialized Deck 2021-10-10 Let's play with Gerudogra Infinite Sparks Edition 2021-09-26 Deskbot Nekroz (11 initial shots) 2021-07-13 Deskbot Nekroz 2021-02-11 Benten Nekroz ~Updated 202108~ 2021-01-24 Add Nekroz Ad Laval Route 2020-12-06 Angel's Nekroz ~Christia Recruitment Type~ 2020-11-16 Angel Nekroz 2020-07-25 Dogmatika Nekroz 2020-04-08 Herald Nekroz 2020-04-06 Benten Mecha Phantom Beast Nekroz (Beginner) 2020-03-31 Benten Nekroz (new rule) See all Deck Lists for "Nekroz" 2022-03-18 Lawn mowing reasoning Nekroz 2021-12-04 sea 2021-12-01 Nekroz from Ocean Dragon Lord 2021-11-22 Banned Little Ritual Specialized Deck 2021-10-10 Let's play with Gerudogra Infinite Sparks Edition 2021-09-26 Deskbot Nekroz (11 initial shots) 2021-07-13 Deskbot Nekroz 2021-02-11 Benten Nekroz ~Updated 202108~ 2021-01-24 Add Nekroz Ad Laval Route 2020-12-06 Angel's Nekroz ~Christia Recruitment Type~ 2020-11-16 Angel Nekroz 2020-07-25 Dogmatika Nekroz 2020-04-08 Herald Nekroz 2020-04-06 Benten Mecha Phantom Beast Nekroz (Beginner) 2020-03-31 Benten Nekroz (new rule) See all Deck Lists for "Nekroz" Update Information - NEW - 07/17 00:39 Review Paleozoic CambrorasterCategory exclusive link 2 monsters

And weve seen it used for both flavor and gameplay reasons