They don't copy whether that creature was tapped or untapped, whether it had any counters on it, whether it had any Auras and/or Equipment attached to it, or any non-copy effects that changed its power, toughness, types, color, and so on
Eternatus V #SV121 Pokemon Shining Fates Keep track of your collection value over time
Its not hugely viable in a match without it, so if you pull this then its worth tracking down a Leftovers card or two
Some examples of notable patterns include: Tinsel Holofoil: Used from the Black & White to Legendary Treasures sets, featuring horizontal stripes across the image and, in Japanese cards, a tinsel effect on the border
Each creature cantripping and growing larger generally gives you a dominant board position and better card advantage than the rest of the table
Or worse, an Oblivion Stone