Quarriors' Deathdealer and expert culling
The consensus on BGG is summed up in this post:

when scoring the death dealer, you would have two &quot;when deathdealer scores&quot; effects that would trigger. 1) cull for points. 2) trade dice.


If two &quot;when x scores&quot; effects happen at the same time, the active player has to choose which one resolves first. In most cases, this should not be a problem, but for deathdealer the choices are mutually exclusive. If you trade first, you no longer have a dice in your possession to cull. If you cull first, you no longer have a dice in your possession to trade. Thus, you either trade deathdealer or cull it for points.