The birthday wish is for B/U zombies. The plan is not to make the best deck, but the best deck possible that is black, blue, and full of zombies. If there is no way of dealing with Rest in Peace , then that's fine: It will be a limitation of the design constraint.
Most people only run 2x Rest in Peace in their sideboard. Assuming a six-turn game, there is only a 1/3 chance of drawing one.
After more play testing, I've come to the conclusion that Killing Wave is awesome.
I think it is good sometimes. Too often people will sac all of their critters except for the important ones. It is, however, almost always incredibly awesome with Blood Artist , as you've surely noticed.
"Dare to fight, defy difficulties and advance wave upon wave... Monsters of all kinds shall be destroyed." - Mao Zedong
[rant] Just splash white. The color of cheap and effective planeswalker removal, creature removal, enchantment removal, artifact removal, graveyard removal and the color of flying, lifelink, indestructible creatures, first and double strike.[/rant]
I don't think splashing white is a good idea, despite what it adds, because this deck wants to run with 22x lands and be very fast. Even with the many possible combinations of dual colored lands, I think mana fixing would be a problem.