The default Shadow leveling build (wowforeverbuilds.com), 51 points, grouped by level range.
GIF1.Priest.523000000100000000-00000000000000000-55552221201310051
Levels 10–19
- from 10: Wand Specialization 2/2
- from 12: Spirit Tap 5/5
- from 17: Improved Shadow Word: Pain 2/2
- from 19: Shadow Focus 1/5
Levels 20–29
- from 20: Shadow Focus 3/5
- from 22: Mind Flay 1/1
- from 23: Improved Mind Flay 2/2
- from 25: Improved Mind Blast 2/5
- from 27: Vampiric Embrace 1/1
- from 28: Shadow Weaving 2/3
Levels 30–39
- from 30: Shadow Weaving 3/3
- from 31: Improved Mind Blast 3/5
- from 32: Silence 1/1
- from 33: Improved Mind Blast 5/5
- from 35: Shadow Reach 2/2
- from 37: Darkness 3/5
Levels 40–49
- from 40: Darkness 5/5
- from 42: Shadowform 1/1
- from 43: Shadow Focus 5/5
- from 45: Blackout 5/5
Levels 50–59
- from 50: Improved Psychic Scream 2/2
- from 52: Twin Disciplines 3/5
- from 55: Power in Light 5/5
Levels 60–60
- from 60: Improved Power Word: Shield 1/3