1 Oct 2008
You can choose a mode only if you can choose legal targets for that mode. If you can't choose legal targets for any of the modes, you can't cast the spell.
1 Oct 2008
While the spell is on the stack, treat it as though its only text is the chosen mode. The other two modes are treated as though they don't exist. You don't choose targets for those modes.
1 Oct 2008
If this spell is copied, the copy will have the same mode as the original.