Forum:Somewhat confused on skill drain....again

I was looking over this and i do not quite understand this...you can still activate stardust dragon;'s effect to negate something even with skill drain on the field??? also 76.223.242.108 03:57, May 27, 2010 (UTC)
 * Stardust Dragon: "Skill Drain" has no effect on "Stardust Dragon". For the first effect, Tributing "Stardust Dragon" is a cost, so "Stardust Dragon" is not on the field and is unaffected by "Skill Drain". The second effect activates in the Graveyard, so "Skill Drain" cannot negate it
 * Will skill drain negate Simorghs effect that says "your opponent cannot set cards"