The Winnie the Pooh franchise itself lacked a cohesive identity, scattered across disparate colors with no unifying synergy to tie them together
What Kinds of Cycling Lands Are There
But this concept got its very own card out of sheer delight
We can confirm it is the Illuminary by looking at the card for Magic Broom, Bucket Brigade, which shows us a close-up of the same scene with flavour text saying: In the immense story-forge known as the Great Illuminary, there is always work to be done. We also get a really good look at this strange purple liquid theyre carrying
A quick note: this situation is constantly changing, and there may be a line for Hiram to return to the game in the future with errata alterations
It will see a lot of play in Limited under the white-black sacrifice archetype, but the card is more genuinely useful in any deck that utilizes black in the format