Monile di Grixis

If this spell is copied, the copy will have the same mode as the original.

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.

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.