Cabal Therapy is the best black card because it is thematically on point, perfectly costed, seismic in its ability with flashback, and can be run as a four-of in Premodern
While this isn't an exact science (since expensive reprints will limit the price of new cards, which might be hurting the Bant deck a bit, since it has the highest-value reprints), this system works pretty well in general
Yes, this combines well with cards like Squirrel Farm or Snake Basket
From top to bottom, some of the notable changes are: the bar with the name of the token extends across the entire width of the card, the art window is no longer rounded at the bottom, the designation "Token" has been added in front of "Creature" on the type line, and the collector's number, copyright information, and artist's name (in this case, Wayne Reynolds) are printed on a solid black background