Iskenderun's Mystic Blast, as it's the same level; it's an upgraded Magic Missile, which orc wizards use; and deep elf sorcerers only get one summoning spell, which holds true for orc sorcerers after this change; so this seems appropriate.

Note that deep elf conjurers, who have lower hit dice, can get sticky flame or bolt of draining in that slot, which are more powerful. Still, I'm not certain whether this might make them overpowered. I suppose playtesting will reveal that.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3907 c06c8d41-db1a-0410-9941-cceddc491573