I think the Element line is filled out wrong. Unless you intend for blood to be an element instead of costing hp, Leech would fall into one of the current 13 categories. (Probably )
That would actually be a cool way to introduce a "13th" element without actually creating a new one.
An element where all costs are paid in HP instead of quanta...
Maybe call the element Blood or Sacrifice or something
For Bazar purposes, they could go under "Other"
Elements are defined by quanta. Quanta is defined by a quanta pool.
Alternate cost mechanics, Pseudoquanta and Pseudoelements are great ways to add new themes without adding new elements.
If Blood is not an element then it should not be called an element. Rather the cards would be put in one of the 13 existing categories (I think Darkness for Leech. Other cards might be in other elements or join SoSac in other.)
PS: Most "13th element" ideas are only called such due to misunderstanding the scope of what an element is. Usually the themes are not elemental themes but rather composite or subset themes. Hence why most work better as composite sets or subsets.