WotLK Mage Spellsteal

[caleman]

speaking blizzlike, is it supposed to have a % chance to steal or does it work 100% of the time?

[Mercy]

It works on a number of factors which include things such as: hit chance, spell resistances (arcane?), resist chance via racials & talents. Here are some examples of things that may affect it;
http://wotlk.cavernoftime.com/spell=822
http://wotlk.cavernoftime.com/spell=31872
http://wotlk.cavernoftime.com/spell=53553

[mier]

I'm wondering if it counts as a dispell effect and is affected by talents such as http://wotlk.cavernoftime.com/spell=29191

[Thorbjorn]

https://wowwiki.fandom.com/wiki/Spellsteal

Spellsteal uses the dispel mechanic and is affected by dispel resistance. There is no known pattern to which buff Spellsteal will target. It attempts to steal a random buff every time. If a buff can be stolen, it will have a yellow border. Otherwise, you will get an error message after attempting to steal it.

It should be affected by Healing Grace.