Originally Posted by
akatsuki
Another card you could consider is Electrickery. More versatile, but it doesn't kill Serra Avenger or Crusader.
Also, the more I play with this deck the more I'm convinced it's the best Delver deck in the format. It has game (meaning at least 45-50%) against RUG Delver, Shardless BUG, Storm and Show and Tell. I'm not sure any other deck in Legacy can actually say that at this point in time. It's also nice that it usually beats up on the creature heavy decks with its galore of removal spells.
At this point, I've tested RUG Delver, BUG Delver, UR Delver, UBR Delver and GRUB Delver, and none of them have a good match-up against a decent Shardless BUG player. Of course, if you're not worried about beating Shardless, then a lot of those decks have stronger games against combo.