This is here to remove a ton of clutter from the forums. If you post something in here, please make sure to provide a WoWHead.com link, the spell or NPC name and effect and where to get it. If theres any extra information (Like how to push it to the extremes) also post that and it will be updated almost daily.
Spellsteal
Aura of Arcane Haste
Rating: 3/5
Found in: Nexus and a new, more powerful version in Blackrock Caverns, link is below.
Caster recieves spell power and spell haste, and party gets a similar effect pulsed every 4 seconds.
http://www.wowhead.com/npc=39990#abilities
Spell Haste
Rating: 3/5
Found in: Magister's Terrace
10% Spell haste, stacking up to 200%.
Sunblade Magister - NPC - World of Warcraft
Haste
Rating: 2/5
Found in: Zul'Aman
300% Spell Haste, 200% Run speed, 30 second duration.
Amani'shi Flame Caster - NPC - World of Warcraft
Arcane Haste
Rating: 3/5
Found in: Halls of Stone
50% Spell Haste for 30 seconds
http://www.wowhead.com/npc=27962
http://www.wowhead.com/npc=20897
Mind Control
Alliance Berserker, Horde Berserker
Rating: 4/5
Found in: Nexus
Casting "Frenzy" in a macro allows it to stack all the way to 25 before the cooldown starts. Bloodlust helps too.
Horde Berserker - NPC - World of Warcraft
Defias Envoker
Rating: 5/5
Found in: Deadmines
Casting Envokers Shield makes the person invulernable to crowd control effects, unlimited duration. Casting Renegade strength (listed as 55 yard range) increases health by 500% and physical damage done by 300%.
Defias Envoker - NPC - World of Warcraft
I'm going to be searching to add more to this list, which will also include a Cataclysm section and "Other" section, which would be from 1-80, and Cataclysm would be all the relevent buffs and mobs that we all want to know about. Please contribute to this thread, so that the end result is a well formed, organised thread that keeps clutter away.
**This was made because of the "Make a sticky MC and spellstealable thread" request in the Site Suggestions thread, that I was told would be great as long as it was constantly updated. I'm up to the challenge, so to speak.