It divided opinions at the time, but Fabled effectively being a soft-reset just two years into the lifespan of Disney Lorcana was exactly what the game needed
You blink any number of non-lands you control, not just creatures, so Ichor Wellspring in artifacts, Mulldrifter in creatures, or Flight of Fancy in enchantments will all work
Currently seeing standard play as well in Monored Aggro decks, its best home is alongside the Hammer
Yes, especially if the card matters enough to move beyond sleeve-only storage and you want stronger rigid support
Every one of these counters that a player is suffering from will cause them to put a card from their deck into the graveyard and also - depending on the card that was removed - either take damage and remove a counter or no damage, but the counter remains
Despite its advanced features, finding opponents can be challenging sometimes, so playing with a friend is often a better option