Nyx Herald — ruling 1

Once Nyx Herald’s ability resolves, the creature keeps +1/+1 and trample even if it stops being enchanted later in the turn (or, in some unusual cases, stops being an enchantment).

Nyx Herald : règles, fonctionnement et interactions (MTG)

Nyx Herald is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

At the beginning of combat on your turn, target enchanted creature or enchantment creature you control gets +1/+1 and gains trample until end of turn.

How it works : Nyx Herald

Original English text — Wizards of the Coast / Scryfall

#1January 24, 2020· Wizards of the Coast
Once Nyx Herald’s ability resolves, the creature keeps +1/+1 and trample even if it stops being enchanted later in the turn (or, in some unusual cases, stops being an enchantment).
No other card is named in this ruling.