Alien Insect 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

Flying

How it works : Alien Insect

Original English text — Wizards of the Coast / Scryfall

No additional ruling has been published for this card.

Interactions with other cards

These cards' text mentions Alien Insect.

Vrestin, Menoptra Leader

Flying Vrestin enters with X +1/+1 counters on it. When Vrestin enters, create X 1/1 green and white Alien Insect creature tokens with flying. Whenever you attack with one or more Insects, put a +1/+1 counter on each of them.