Any choices made on resolution, such as whether to put counters on a permanent, are also made individually.
It's a straight-forward task, something important when starting a game as complex as Magic
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
FromTheShire: I think the theory is that the mayhem cost DOES make it cheaper, because you're also trying to flip Norman Osborn into Green Goblin and getting that sweet reduction
There is a ton of freedom with Improvisation Capstone and you can still hit an Omniscience and stop there
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