Beat UWR Delver 3 times at SCG last week, once in Top 8 even. Multiple Massacres in the board and sticking a Xantid Swarm make the match up easier. I'd rather play UWR Delver than RUG.
Boards in Massacre, also boards in Xantid Swarm.
On top of that, what is with people siding in Xantid Swarm against decks with removal/Lightning Bolt?