What it does
I'm not familiar with "Midnight Entity" as an official Magic: The Gathering keyword or ability. It's possible this is a custom or unofficial term, a card name, or something from a non-canonical source rather than a recognized rules keyword.
If you meant a different mechanic, here are some real ones that sound similar and relate to similar themes:
- Daybound/Nightbound (from Innistrad: Midnight Hunt): the day/night cycle that transforms certain werewolf-style permanents.
- Disturb: cast a card from your graveyard transformed, common in that same set's spirit theme.
- Coven: checks whether you control three or more creatures with different powers.
If you can confirm the exact card name or set, or paste the rules text, I'll gladly give you a precise, Commander-focused breakdown of how it works, the common rules pitfalls, and when it matters at the table.
Iconic cards with Midnight Entity
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