Like most Magic: The Gathering cards, the value of Beast depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Starter Commander Deck Tokens)
How much does Kenrith, the Returned King cost
I cant imagine Curse of Oblivion is worth it even in some kind of curse-y deck
A small diamond cut, which is a defect that sometimes resembles trimming , can also be allowed
When choosing the base creature - get something that poses a similar threat instead of something not just looks alike
Looking more generally, raw single cards can range from a couple of dollars to a couple hundred