>>96095837
one box of ardboys
one old world doom diver
one box of mantic shooters

throw away the goblins in the doom diver and convert 2 ardboys for its crew: one carrying a projectile (a simple rock), and one loading the mechanism instead of the goblins

use 6 of the remaining ardboys to convert ranged units by using the resin arms with crossbows sprue of the mantic box, then send back the box to mantic with the claim they gave you a box of warriors/boomers instead of the same box with the additional resin sprue

use the 2 leftover ardboys to convert an ardboy big boss and something else