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Originally Posted by Krathis
The thing about Amplify Curse is it's such a minor dps increase that realistically the push back resistance on Drain Soul is more valuable. Also the more haste you have the less valuable Amplify Curse becomes and it does virtually nothing when bloodlust and/or eradication are up.
The short answer is no, not really. Amplify Curse is slightly better dps until your haste hits a point your gcd is 1 second to begin with. The long answer is push back resistance on Drain Soul may be better dps in some situations.