This card has been disregarded as too expensive and ineffective. I will have to agree that at low player counts this might be truth for reasons already stated in previous reviews. At high player counts though it can be a strong asset (I mean event), specially on highly specialised investigator teams that rely mostly on 1 investigator to deal most of the damage in the mid-late campaign.
The more ammo/supply tokens you already have on an asset, the more value you get out of this card. For this reason it requires some good teamwork and planing to find the best window of opportunity to play this card. If you time it right you can be adding 10+ bullets to the big gun of your fellow guardian with Contraband. Here is an example how this worked in one of my 4 player games:
- Mark Harrigan plays Lightning Gun, he uses one bullet to kill a snake-person but then he manages to add 3 bullets with Extra Ammunition. Then Wendy Adams plays Contraband transforming those 5 bullets into 10, then she plays Wendy's Amulet followed by playing Contraband from her discard pile adding 10 extra bullets to the Lightning Gun for a total of 20 bullets. Jenny Barnes also ran 2 copies of contraband and had one in hand meaning she could have transformed those 20 bullets into 40! but she thought 20 was enough and didn't use it, a decision she would later regret.
If used right Contraband is an amazing team combo card that can grant your guardian a big gun with almost unlimited ammo. Someone who doesn't have much experience playing at higher investigator counts may now be thinking "that's unnecessary, you don't need that much ammo". To that I will respond that at 4 players the encounter deck recurs very quickly, which can result in a constant flow of 3 hp enemies every round and if you are on the last scenarios of a campaign you will most probably be facing a boss (sometimes even multiple bosses with 20+ HP!) and maybe, only maybe, also one of those damn enemies that come back from the grave (I mean victory display)! So yeah the extra bullets are not only welcomed but sometimes even necessary.
In conclusion: The main function of this card should be to grant your guardian an almost unlimited amount of ammo for his big game gun. This is a powerful strategy at high player counts because of the constant flow of enemies and specially if you are relaying on a guardian to deal most of the damage for the team. Some cards that are not playable at lower player counts can be amazing at multiplayer...which makes trying different player counts a fun experience.