When Stampede is available, the buff icon is called Stampede - The tooltip indicates that you can use ravage out of stealth with no cost or position requirement.
When Stampede is on cooldown, we gain a buff called Stampede, the tooltip indicates that the ability is not yet ready.
Can not set up PowerAuras to track this ability because we technically ALWAYS have it.
Dream of Cenarius is the same way. The name of the buff never changes, only the tooltip indicating rather our next heal is for 30% or our next abilities will do 30% damage.