Mirkwood Spider
The ability to pay mana and ping each opponent isn't incredibly powerful, but it is a way to keep things rolling in decks such as Rakdos, Lord of Riots or the more recent Ob Nixilis, Captive Kingpin without having to have spells or other nonland permanents around to help generate life loss
In order to do that, I made sure that for each set in the Cube I had an equal distribution of colors across the cards that were picked
This is especially potent with Sire of Insanity, which can come out on turn four with a Heartless Summoning to make your opponent discard his or her entire handbut your opponent probably didn't need that, right
The Royal Blood set contains 119 cards in total, spanning 6 Leader, 45 Common, 30 Uncommon, 26 Rare, 10 Super Rare, 2 Secret Rare
I often get readers writing to ask when its OK to quit a game