Like most Magic: The Gathering cards, the value of Decimate 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 (Secret Lair Drop)
(And not just because it's an inanimate object that can't actually grab things.) To be fair, Future Sight was a set full of many unusual cardboard squares, all of which at least technically claimed to be Magic game pieces
Chart shows the price of Radiant Charizard #11 at the end of each month going back as long as we have tracked the item.
The combo revolves around Pactdoll Terror and some Affinity mainstays, allowing you to drain the opponent of all their life
Being a swamp is still a lot better than being a discard spell against a hellbent opponent
Lets just say if you were opening a 1st Edition Base Set Booster Pack, there are plenty of other cards youd want to pull first