Amida Buddha is the best guide to the Buddha nature which is
the true nature of all beings. However, attaining Buddha nature
does NOT mean that transcendent Buddhas like Amida stop existing.
Rather it means Amida takes you to a
dimension where all Buddhas dwell. It's like escaping a prison
(samsara) and joining all Buddhas in the same beautiful park where
you can know each other and have fun together. Of course,
discovering Buddha nature is beyond words and conceptual
understanding, but I'm using this image just to help you stop
falling into the wrong view of nihilistic voidness.
If you think that Amida and His Pure Land will stop existing when you attain perfect Enlightenment, that is the wrong view of nihilistic voidness. If you think that Amida and His Pure Land are only metaphors or symbols for the ultimate reality or Buddha nature then again, you fall into the wrong view of nihilistic voidness. Holding to such views and teaching them to others is to slander the Amida Dharma and is a karma that leads to rebirth in Avici hell. Actually Amida is living in THE SAME TIME in ultimate Dharmakaya or Buddha nature, in Sambhogakaya form in His Pure Land and in innumerable Nirmanakayas or accommodated body manifestations all over the samsaric universe for the sake of saving and guiding sentient beings. All Buddhas live and manifest in the same way. This is the Trikaya (three bodies doctrine). In Jodo Shinshu we also say that Amida (and all Buddhas) have two bodies where the Dharmakaya of Buddha nature is the first body and the Sambhogakaya and various Nirmanakayas are considered the second body which is called the Dharmakaya of Compassionate means. So, Amida Buddha in which you have faith is AT THE SAME TIME Amida as Dharmakaya of Compassionate means and Amida as Dharmakaya of Buddha nature.