Here's a list of many of the staves (singular: staff) you can brandish in order to trigger a magical effect  in the game. Where moer than one spell is listed brandishing will cast all of them at the same time! There are more to find so keep exploring!

Thanks to Latharia and Oyg for providing this info.

Learn more about the magical items in the game 

Staff Location* Level* Staff
Level**		 Staff
Charges**		 Spell
Level**		 Spells Flags**
 Ancient Vessel of Aquarius     19 11 10  create spring  glow, magic, anti-evil
 angel wing  port  13/30 2 5  30   fly, +40 mv, -8 ac  glow
 ash staff Milarbor  shop 19/19   20 5  18   blindness  
 auburn orb  graveyard 3/10         charm person  
 bandaid  ark 38/50   33 2 51   heal nodrop 
 beholder's eyestalk underdark 51/20   51 3  21   energy drain  glow
 birch staff  Milarbor  shop 24/14  16  4  13   flamestrike  
 Black [1]  High Tower of Sorcery 80/81         change allegiance  
 bloodstone     19 2 11  energy drain  hum, evil, magic, anti-good
 blue crystal staff  crystalmir 44/29   43 5  31   heal  magic, anti-evil, anti-neutral
 box of matches  Hell 42/48  40  27  47   sleep glow 
 bunch of bananas  ark 42/48  44  6  48   armored sphere magic 
 Burnt [1]  High Tower of Sorcery 83/21         blindness  
 caduceus staff  New Olympus 1/8   6  2  8  cure serious  
 cloudy glass staff  Yggdrasil 25/9  26  8  11   refresh invis 
 cruel necklace  Kraig’s Keep 9/29  13  5  30   energy drain  evil, nodrop, anti-good, anti-neutral, noremove
 deck of playing cards  White Lotus 10/12  8  5  14   fly  magic
 devilish talisman  Astral plane 19/24         flamestrike, -10hp  
 dull rod      20 2  10   protection  glow, hum, magic, bless, anti-evil, anti-neutral
elemental staff of earthquake [2]  Elemental Canyon 16/7   17 1  8   earthquake  glow
 Elder [1]  wormskull 22/17         heal, +1 wis  
 evil gem [1]  Ultima 60/60   58 1  60  harm, +3 int, +50 mana  dark, evil, anti-good, anti-neutral
 eye of the eagle      57 7  39  infravision magic 
 flame thrower  Demonia 83/75   83  5  75  fireball  glow, evil, anti-good
 flaming book New Atlantis 21/16         fireball  
 golden flute  High Tower of Sorcery 81/79         cause critical, -6 int  
 golden harp  thalos 7/18         call lightning  
 heavy oak staff [3]  Moria 8/15   9 3  14   harm  anti-good
 Holy [1]  Holy Grove 8/40       bless   anti-evil
 horn of plenty  ark/flood 36/44   32 5  43  invis   glow, invis, anti-evil
 huge eye of justice  underdark 45/20  43  4  20  acid breath   glow
 ice staff  haven 33/11  33  3  12  frost breath   glow
 ice staff  Elemental Canyon 7/8  2  1  8  ice storm   glow
 iron monk style [1]     37  1  45   sanctuary  dark
 Ivory [1]  New Olympus 39/30        sanctuary  
 kracken's eye  IOPL 15/51   17 5  49   detect hidden  dark, evil, anti-good
 lamp  great eastern pyramid 25/25   26 4 25   fly, +1 hitroll, -5 ac  glow, hum, magic, anti-evil
 lightning bolt staff port 5/10         shocking grasp, +15 mana, angelic only  
 Lime-green peridot New Atlantis 15/15        invis   
 long black stick  Dwarven Kingdom 22/4         cure critical  
 looking glass  Yggdrasil 5/11   6 9  9   detect invis  magic
 Magic Mushroom  Cursed Wood 9/19  6  31  21   create food  glow, invis, magic
 Ninja [1]  Akaikiku (nippon) 47/29         blindness  
 oterion's spellbook  Milarbor  53/20  52 2  18   acid breath  
 peroxide  ark 37/35  32  1  35   well of life, -5 damroll, -10 hitroll  nodrop
 phoenix feather  lost valley 90/94         fire breath  
 pile of slime  lost valley 72/87         weaken  
 pixie stick  enchanted woods 49/29         fly  
 pulsating heart      20 4  26   harm  glow, evil, magic, nodrop, anti-good, anti-evil, noremove
 red and white [1]  High Tower of Sorcery 82/20       heal   
 Red DragonOrb      46 6  12   sanctuary  magic, anti-good
 rivit gun  hell 47/47  42  25  46   high explosive  
rod of command     40 23  39   flamestrike  dark, anti-good, anti-neutral
rudely shaped wand [4]  keep 56/51         change sex  
silver flute  thalos 7/17   6 2  17   charm person  glow, magic
small figurine  High Tower of Sorcery 80/80         cure serious  
small horn  lost valley 80/81         lightning breath  
small wooden staff      25 3  1   create food  magic
sparkling dust  High Tower of Sorcery 80/19         obscurement  
spiralled tusk  river  46/50  47 1  51   subzero pond  glow, magic
staff of darkness     21  2  9   Obscurment  dark
staff of the elder [5]     20  11  18   heal  dark
stag's horn ???  6/7         cure poison  
strange amulet      67 4  70   earthquake  evil, nodrop, noremove
toy soldier     53  2  40   protection  
true vision  sea singer shop 20/79         real vision  
ugly skull of Draco      21 6  15   call lightning  hum, magic, nodrop
white marble cross  coven 81/35         sanctuary  
wooden spoon  oasis 78/78         create food  
yellow canary feather New Atlantis 66/21         sanctuary  

 * info provided by Latharia       ** info prpvided by Oyg

[1] Larathia misses “staff” of the end of the name 

 [2] Larathia’s record doesn’t have “elemental” in the name

[3] Oyg had duplicate records for this item

 [4] apparently a staff not a wand despite the object name

[5] possible duplicate of "elder" earlier in the list