The best planetary combinations for clairovoyance, or evensiddhis (spiritual powers) are:
a) Connection of Ketu with Jupiter, involving the 5th house and its lord, the 8th house and its lord, or the 12th house and its lord.
b) The second best is, the same combination as above without the involvement of Jupiter.
c) The third best is Ketu in the 12th house without any aspect, Moon in the rashi (sign) of Saturn aspected by Mars, or in the rashi of Mars aspected by Saturn, with Jupiter influencing the lagna (ascendant) or lagna lord exactly.
The best example I have seen to date, though I have not succeeded in collecting the horoscopes of other gifted saints, is that of my own Guruji (Swami Paramananda Saraswati). Note the combinations.
Swami Paramananda Saraswati's Natal chart
Swami Paramananda Saraswati's Navamsha chart
a) Ketu in the twelfth house aspected by the 5th and the 8th lord, Jupiter.
b) In the navamsa, as also in the birth horoscope, the Moon comes under the influence of both Saturn and Mars.
Since very early in his life he took to sannyas (renunciate vows) and maintained the pure spiritual life throughout, and went rising higher and higher. Clairovoyance was one of his supernormal achievements, or siddhis.
reprinted with permission