Ok, many old raiders may remember Lucifron. He had this really annoying curse -
Lucifron's Curse - Spell - World of Warcraft
This, when applied on death knights, makes it so everything requires 0 runes. It lasts 5 minutes, and you can easily do the hardest encounters in the game exploiting this fact. The dps of a death knight rockets up without the limitations of runes.
it is also a debuff, so you could in theory when arenas come out start the match with this still on.
Have fun being godlike!