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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?
