If you're worried about losing a somewhat more vulnerable source for doubling your tokens, don't worry
During the late 18th century through mid-19th century, cataloguing on paper slips or cards gradually replaced ledgers and books as the main medium for library catalogs, and in the 20th it was long ubiquitous
It does, however, ask that you have a creature on the battlefield, where spells like Animate Dead, Reanimate, Exhume, and Unburial Rites do not
These are still played in the formats where theyre not banned
This is an extra little bonus and means each deck has four legendary foils instead of just three
Plus, you can use online resources like the TCGPlayer Market Price to get an idea of how much similar cards are selling for