I do think that control decks could use a bit more help against some of the degenerate combo decks of the format, however, I would be concerned that adding Force of Will might simply be pushing Modern into being more of a diet version of Legacy
The fact you get to draw on EtB and on attack (without doing damage!) makes this an auto-include for any deck in blue that has a creature theme
Furthermore, Moonrager's Slash was about as awkward as can be, never costing one Red mana when you really needed it and then often leaving unused mana when finally cast on the night side
In his spare time when he's not playing Magic, writing about Magic or doing his day job, he runs a YouTube channel or two, keeps up a College Football Computer Poll, and is attempting to gif every scene of the Star Wars prequels
And dont let me stop you from following your Magic dreams if theres a box that you want and its within your budget