野原みたいで素敵でしょう？ De purpose


> 野原みたいで素敵でしょう？  
>  野原みたい素敵でしょう？

Can anyone explain the nuance added by de here? I feel like it may be a
conjunctive copula, or perhaps it is meant to be a location marker? I'm not
sure if it means "At somewhere like a field would be wonderful wouldn't it?"
or if it means "It's something like a field, and it's wonderful isn't it?"




Your second sentence 「野原みたい素敵でしょう？」 sounds ungrammatical.

> 野原みたい **で** 素敵でしょう？

According to 明鏡国語辞典, the で is part of 「みたいで」, which is the continuative form
(連用形) of the auxiliary 「みたいだ」:

> みたいだ 〘助動 形動型〙｟みたいだろ‐みたいだっ・みたいで・みたいに‐みたいだ‐みたいな‐みたいなら‐○｠

So the sentence consists of:

> (omitted subject が) 野原みたいだ。 + 素敵だ。 + ～う？  
>  (omitted subject) is like a field. + is wonderful. + ~~ right?

