Name this white-on-black cultivar?

[d.tol]

I dont know if this type of thread is frowned upon but was looking to narrow down the possibilities. Its a bag seed from shwag so there is no information on the heritage of this plant.

 

[mysticepipedon]

Purple McSlurple is as good a guess as any.

There's no way anyone can tell you what strains might have gone into this cross, unless they're geneticists. There are thousands of strains and the gene pool is a mile wide and an inch deep.