For players, it adds cards that can fit into commander or draft decks
Any choices made on resolution, such as whether to put counters on a permanent, are also made individually.
At that point in the game, there will be big targets on the board, and being able to remove them will be what you will need to do to win the game
The Nazgl breaks one of the fundamental rules of Magic, the four-copy limit (or the singleton rule in Commander)
But mass untappers where you have to jump through hoops (like paying mana or recurring a trigger) are still viable, so long as the creatures youre untapping can generate the right mana or other effects to repeat the loop
The exiled card gains 'The player who controls the permanent that exiled this card may look at this card in the exile zone.'" Any player who has controlled a permanent with a hideaway ability since a card was exiled with it may look at that card