The melee version of the .35 Winchester and Song of the Dead, with the significant advantage that, of the three, it doesn't use ammo. The others already come with a lot of ammo on account of their damage output being highly random, but infinite is still better.
Two kinds of investigators want this card, the first is hunters with high agility to use the fast action, which is to say Lily Chen and "Skids" O'Toole. Skids has the edge in that he can use Daring Maneuver to turn a flat success on the main attack into a +2, while Lily currently has no way to fix the result after the fact. Of course, skids will be missing the hand slots for investigative tools, while Lily is more comfortable with a 2-hander.
The second type is investigators with access to the level 1 Seeker pool, for the sole purpose of taking Steady-Handed. Steady-Handed lets you trigger it on a 1, 2 or 3 over target, every round. Being able to hit 3 damage 1/round will carry you through most of the game, and since it doesn't have to be ready to use the primary attack, you can follow up with +2 attacks to finish off 4 or 5hp enemies. As a bonus, hitting that +2 will heal a horror. That's amazing value. The only unfortunate thing is that between Roland, Joe, Vincent, Carolyn and Rex, two don't want a weapon and the other three don't have the agility to use the fast action.
Additional cards to consider:
• Blasphemous Covenant has synergy with additional token fixing, if you're playing with curses.
• Strong-Armed lets you re-roll at the cost of health.
• BTB Roland with the Due Diligence loves Hold Up, and Red Tape even makes it fast.
• Skids and Lily may like Grievous Wound, which lets you add a DoT with the fast attack for enemies you plan to evade.
• Skids theoretically likes False Surrender, which bundles action economy and a small skill bonus in one.