Ki can be converted into channel uses or spell slots when using Full Pouch on Tea of Transference (up to 2 less than your highest level spell). You can generate more Ki through the Ki Channel. Full Pouch can be used twice thanks to the echoing spell: once to recharge itself and once to cast another spell or replenish channel energy. Once it's airborne, you can gain unlimited ki and channel energy as well as infinite spell slots that are up to two levels lower than your highest level spell. Since you need a Ki pool, a 3d6 channel, and an Echoing Full Pouch that is two levels lower than your highest level spell, it is a high-level combination.