There is a bug with the 4 parts t8 resto set bonus, that allows you to get the instant heal multiple times when casting rejuvenation.
Here's how it works:
- You can reproduce it manually, but I suggest you to use a macro to make it easier (like /castsequence Rejuvenation(Rank 15), Rejuvenation(Rank 14)).
- Just spam this macro, and what you'll see is the following: initial rank 15 rejuv instant heal -> 4x instant heals (without actually casting a rejuvenation, so basically it's a nice mana free heal) -> instant heal from the rank 14 rejuv.
Benefit: 6 "procs" instead of 2, and 5 instead of 1 when you'll get better at it and time it right (by stopping the macro spam after the fifth instant heal).
What's the bug: When you spam the macro, you'll see "A more powerful spell is already active." for a second or two, and it's the spam during the error message that induces the extra instant heals (you can't actually cast your rejuv, but it still procs).
Screenshot (what you see are the instant heals from the set bonus, overheal from normal rejuvenation ticks don't show up in the combat log):
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