Like most Magic: The Gathering cards, the value of Spike Feeder 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 (Battle Royale Box Set)
Wizards currently makes zero direct dollars off of cards like Wheel of Fortune or Underground Sea
If you pay full price, bouncing two blockers easily opens the door to a good alpha attack or saves you from one
Other graveyard recursion, like Eternal Witness, Rob the Hoard, and more help turn your mill spells into value ones as well
She also gets around edicts, while being untargetable in most scenarios
With a 4 mana cost, this 2/3 creature really rewards you for getting creatures into play, something that green decks tend to like doing anyway