It Came from Planet Glurg — ruling 1

It Came from Planet Glurg copies exactly what was printed on the original creatures and nothing more (unless any of those creatures are copying something else or is a token; see below). It doesn't copy whether that creature is tapped or untapped, whether it has any counters or stickers on it, and Auras or Equipment attached to it, or any non-copy effects that have changed its power, toughness, types, color, and so on.

It Came from Planet Glurg — ruling 2

If an effect needs information about the creature's name, it looks at all its names to determine that information. For example, if It Came from Planet Glurg becomes a copy of both Blorbian Buddy and Rat in the Hat, it has six words in its name. The first letters of its name are B and R. A creature with alpha strike whose name came before Rat in the Hat alphabetically would have first strike while in combat with it.

It Came from Planet Glurg : règles, fonctionnement et interactions (MTG)

It Came from Planet Glurg 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

You may have It Came from Planet Glurg enter as a copy of X different creatures on the battlefield. (It has their total power, total toughness, combined mana costs, all text boxes, names, art, and so on.)

How it works : It Came from Planet Glurg

Original English text — Wizards of the Coast / Scryfall

#1October 7, 2022· Wizards of the Coast
It Came from Planet Glurg copies exactly what was printed on the original creatures and nothing more (unless any of those creatures are copying something else or is a token; see below). It doesn't copy whether that creature is tapped or untapped, whether it has any counters or stickers on it, and Auras or Equipment attached to it, or any non-copy effects that have changed its power, toughness, types, color, and so on.
No other card is named in this ruling.
#2October 7, 2022· Wizards of the Coast
If an effect needs information about the creature's name, it looks at all its names to determine that information. For example, if It Came from Planet Glurg becomes a copy of both Blorbian Buddy and Rat in the Hat, it has six words in its name. The first letters of its name are B and R. A creature with alpha strike whose name came before Rat in the Hat alphabetically would have first strike while in combat with it.
No other card is named in this ruling.