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Does Portent of Far acutally allows the player to reroll 1 to hit when casting Magic Missiles and generating number of hits also?

Thanks!

It says in the description...
"If SUCCESSFULLY (my emphasis) cast, all SUBSEQUENT dice rolls of a 1 made either to hit or to wound by that unit can be re-rolled that turn.... (Description continues)"

So as no magic missiles ever roll to hit (they hit automatically) that is out.
Number of hits is not a roll to hit, remember you have hit automatically.
However you would reroll any 1's rolled when rolling to wound.