Modern Rules Problems - Spellskite
Since Spellskite can target anything, I think it would've been worth a mention concerning bluffs with Spellskite, until where they are ok, and where they stop beeing ok.
Aka, it is ok for me to target Kiki-Jiki's ability, knowing full well that it won't do anything when it resolves, hoping that my opponent does something not optimal in response - e.g. tapping out to kill Spellskite, or even conceding the game thinking he will loose now.
However, I may not lie about the outcome of the ability resolving, so if my opponent asks me ‘so I get a Spellskite now’, I have to answer with no (if he asks ‘so I loose now?’, I could still answer ‘Well, you obviously aren’t dead, so I can't say anything about that').
This finesse has already gotten people DQ'ed, so I think it is kinda important.