Mandala offering is a powerful method for accumulating extensive merit in a short time especially for those who have passed on or in a confused state of mind. The accumulation of Amitayus prayers and mandala merits can be dedicated to them to have a good rebirth and have the 3 Jewels bless them. The Sanghas are truly selfless and compassionate...
The Merits of Buddha Amitayus Practice:
Buddha Sakyamuni has spoken about the power and the great benefit of Buddha Amitayus's mantra. According to the Sutra, it's said that the merits accumulated from offering Buddha with the most precious stones that fill the universe can be counted, but the merits of recitation the mantra of Amitayus is far too vast to be measured. Lord Buddha also given the example that reciting Amitayus mantra is liken a ninety nine millions Buddhas remain in Samadhi and chanted the mantra in one voice … thus it's extremely powerful.
The Tibetan word for mandala is kyil.kor: kyil is essence, kor is taking—taking the essence. The term means taking the essence on the base of offering a mandala, and what you get from this is merit—the cause. Therefore the essence you take is the generation of the whole path, from guru devotion up to enlightenment, as well as the result, the unification of the dharmakaya and rupakaya. The cause is merit, the path; and the result is enlightenment. In other words, from this practice inconceivable temporal and ultimate happiness results. One is making unbelievable business with the merit field!
It is mentioned that the better the quality of the offerings that one can imagine, the more details and clarity, the more merit one accumulates. The offerings are explained in the commentaries on the mandala, but it is very good to recite the verse from Lama Choepa when you offer the mandala alone, because you then have the leisure to visualize clearly. Doing it this way you dedicate the merit from each offering for the sentient beings as it is performed. It is very effective for the mind.