
This seems like a great combat spell for a lot of characters, mostly of the mystic-guardian typing.
Works well in...
-willpower focused Sister Mary.
-Diana Stanley before she gets her willpower up.
-secondary weapon/dragon pole/willpower focused Lily Chen
-works with Boxing Gloves and Nathaniel Cho.
It's slightly less good for straight mystics since it can't take as much advantage of Arcane Research and Down the Rabbit Hole (but no worse the Armageddon and Eye of Chaos which also only have 1 upgrade step). For this reason Norman Withers might be interested in this he has less Incentive to take arcane research.
Sefina Rousseau, Patrice Hathaway and to a lesser extent Daisy Walker and Carolyn Fern can use the lower level one for a bit of offense (since there is no level 2 attack spell aside from the awful Song of the Dead
Edit: someone pointed out this spell is somewhat similar to the M1918 BAR. This costs way less, does more total damage (by 1), spends no ammo on fail, is safer when attacking enemies engaged to other investigators, and doesn't use your hand slots.
To compensate, Brand doesn't synergize well with ammo stuff, has less potential accuracy (i.e. if you spend 4 ammo at once you can get +4 strength) and less damage per shot (can do 5 damage in a shot vs only 3 on brand).
I think both are good, but brand is slightly better in most combat decks. You have to build around the m1918 bar a bit more.