Like most Magic: The Gathering cards, the value of Exsanguinate 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 (Foundations)
Any time you pick up a new Magic: The Gathering preconstructed Commander deck, youre going to want to swap out a few cards to get it a bit closer to a competitive state
If you want a clean card but prefer not to spend over $100, you can settle for an LP copy, which should cost you closer to $62.99, while a damaged copy will only run you about $15 if the condition doesn't matter.
Fun fact: internally, we referred to this issue as the "Thalia Problem"
There is actually a perfect ten copy listed on eBay for $200,000 at the time of writing, although despite there being 90 people watching the listing, none seem willing to bite at that price
Ondu Spiritdancer is a bit like a Doubling Season for your enchantments (more on that card later) and has a chance of keeping something like its current tag of $30.00