I'm interested in making Grixis Delver a little more aggressive, as pyromancer has not been impressing me. Has anyone tried Swiftspear?

Draft:

4 Deathrite Shaman
4 Delver of Secrets
4 Monastery Swiftspear
2 Gurmag Angler

4 Chain Lightning
4 Lightning Bolt
1 Price of Progress

4 Ponder
4 Brainstorm
4 Gitaxian Probe

4 Force of Will
4 Daze
2 Thoughtseize

4 Scalding Tarn
4 Polluted Delta
1 Bloodstained Mire
1 Badlands
2 Underground Sea
3 Volcanic Island

Sideboard
1 Smash to Smithereens
1 Abrade
3 Pyroblast
3 Surgical Extraction
1 Thoughtseize
1 Price of Progress
1 Diabolic Edict
2 True-Name Nemesis
1 Marsh Casualties
1 Flusterstorm