the only thing mista would have to promise is a willingness to get justice for the dude who died. mista is honestly gonna assume he died in a shitty unjust way since he's so pissed off after death. so, i mean, there's that. or this giant handful of diamonds, but what will a ghost do with diamonds.

edit: IF THE ABOVE DOES NOT WORK, he will ask maya for help. can maya chat with the spirit of mr snakebutt?