The Heroic ability says "Whenever you cast a spell that targets [creature]...," and Possibilty Storm says "Whenever a player casts a spell from his or her hand, that player exiles it..." I know by the rest of Possibilty Storm's ability, the exiled card with the same type as the original will apply to the Heroic creature (assuming it is a "target" spell), but what of the original spell? Upon casting the original (lets say Dauntless Onslaught), will the targeting happen simultaneously with casting, activating the Heroic target(s) ability(s) before the spell is exiled from Possibility Storm? Obviously, Dauntless Onslaught doesn't resolve, so there isn't any +2/+2 business, but does the targeting still apply?