Whenever you cast another thrull creature spell attach Basal Thrull #2 to it. That thrull gets +1/+1. and gains thrull gains that ability "


: attach this thrull and all thrulls attached to it to target thrull. That thrull gets +1/+1 to it for each attached thrull."
See Challenge # 139.
So my card was Basal Thrull from Homelands. I didn't really know what do for a thrull other than I figured it'd be black. I designed the card off of the word "basal" and knowing thrulls are made from dead flesh. I figured base would mean that this thrull is used in the creation of other thrulls.
Ha! I'm glad you got this. I probably would have spent hours trying to warp this into some sort of 'Basil Thrull'. A thrull that sweetens any stew he's thrown into? Clearly something to do with 'when you sacrifice'... maybe he improves fish and birds?