It doesn't copy whether that permanent is tapped or untapped, whether it has any counters on it or Auras attached to it, or any non-copy effects that have changed its power, toughness, types, color, and so on
Since Imperm is a trap, it can be set on your field to be triggered on your opponents turn
For this reason, acquiring specific cards that you need to complete a deck, such as middle-stage evolutions, or powerful EX cards, can be extremely time-consuming and tricky
The targeted Monster then becomes the only Monster you can declare an attack with that turn, but each time it destroys a Monster, it can make an additional attack during that Battle Phase
New promos, exclusive variants, and bundles with retailer-specific cards are continually being added, requiring collectors to navigate a growing and fragmented release schedule, and potentially making 151 Pokmon cards more expensive