U/R Storm+ SoI

so the main thing im looking @ here is
Harness the Storm :
Whenever you cast an instant or sorcery spell from your hand, you may cast target card with the same name as that spell from your graveyard. (You still pay its costs.)

the List im using in on my profile
        2 [KTK] Flooded Strand
        1 [UNH] Mountain
        3 [] Shivan Reef
        3 [UNH] Island
        3 [RTR] Steam Vents
        4 [KTK] Polluted Delta
        4 [] Goblin Electromancer
        4 [ZEN] Pyromancer Ascension
        3 [] Desperate Ravings
        4 [CHK] Desperate Ritual
        4 [SHM] Manamorphose
        4 [M11] Pyretic Ritual
        4 [DKA] Thought Scour
        2 [TSP] Grapeshot
        3 [ISD] Past in Flames
        4 [NPH] Gitaxian Probe
        4 [FD] Serum Visions
        4 [9E] Sleight of Hand

SB:
SB:  3 [M11] Lightning Bolt
SB:  3 [TSP] Empty the Warrens
SB:  2 [] Echoing Truth
SB:  2 [9E] Defense Grid
SB:  3 [] Sowing Salt
SB:  2 [10E] Shatterstorm

so im wondering what peoples thoughts are on possibly slipping in the Enchantment maybe in place of past in flames or something else not sure
but having an extra copy of PA or a PA like ability seems good to me the mana i can generate makes it so paying the cost isnt so much an issue