General DiscussionNullifier doesn't nullify oracle's immortality spell

Orchid Oracle = NULLIFY ORACLE'S IMMORTALITY SPELL

So it shouldn't that's the point of that spell.

If you hover over the spells, you can find a nifty description regarding the spell.
It contains information whether a spells can be dispelled by basic dispel or does it require strong dispel, or it isn't dispellable.