Amoghasiddhi, 'infallible success', is the Buddha of the north in the five-Buddha mandala, green in colour, the right hand raised in the abhaya mudra of fearlessness and the crossed vajra (vishvavajra) as his emblem. His wisdom is the all-accomplishing wisdom (krtyanushthana-jnana): the activity that does what is needed and leaves no residue, and he heads the karma family, seated on a garuda. Like Ratnasambhava he has almost no independent sutra cult and is met chiefly through the tantric mandalas, where his green north completes the set filled by Akshobhya's blue east and Amitabha's red west.
Modern Practice
He is visualised in the five-Buddha mandala and invoked before long or difficult undertakings, and in Tibetan practice the green north is used in the mandala offering and in rites for activity. The Western reading of him as a god of success flattens the claim, which is that action taken in accord with the teaching does not come to nothing — not that any project will be blessed.