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For the Planeswalker Jace, Architect of Thought, does his first ability -1/0 apply to just one of your opponents attacking creatures or could it apply to all?

+1 Until your next turn, whenever a creature an opponent controls attacks, it gets -1/0 until end of turn. 

it triggers for all creatures that attack

Please Autocard: [c]Jace, Architect of Thought[/c] = Jace, Architect of Thought

Yes it applies to all of your opponents attacking creatures, not just one.  Jace's +1 ability sets up a delayed trigger that will trigger for each creature an opponent attcks with, giving it the -1/0 penalty.

Ah, excellent! Thank you for clearing that up. This helped a lot.