The Emperor of the Holy Britannian Empire. Unashamedly supremacist and discriminatory, as exemplified by this quote:

> All men are not created equal! Some are born swifter of foot, some with greater beauty, some are born into poverty, and others born sick and feeble. Both in birthland and upbringing, in sheer scope of ability every human is inherently different. Yes, that is why people discriminate against one another, which is why there is struggle, competition, and the unfaltering march of progress.
> > Inequality is not wrong -- equality is! Consider the EU, which made equality a right: rabble politics by a popularity contest! The Chinese Federation, with its equal distribution of wealth: a nation of lazy dullards! But not our beloved Britannia! We fight, we compete; evolution is continuous. > > We will fight on. We shall struggle, compete, plunder, and dominate. And in the end, the future shall be ours. All Hail Britannia!

So I wanted some mechanics to represent his ruthlessness and imperial dogmas. Sacrificing creatures seems appropriate, and a way to get extra value from sacrificing your creatures seems apt as well.

Slightly annoyingly this design fits better with the (Black-green archetype) than the (White-black archetype), but not every rare has to fit into the archetypes. And the Emperor of Britannia, the black-white faction in this set, has to be black-white.