It wont hit particularly hard, but its metalcraft ability is an interesting one
I really love this as a way to end games quicker for combat-focused decks, and it gets stronger the more combats you take
Like most Magic: The Gathering cards, the value of Valley Questcaller 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 (Bloomburrow)
As a kid, you probably tried to justify your Pokmon collection to someone on the basis that it would one day grow in value
Obviously, if you have graveyard synergy, flashback, or cards you want to discard, the effect is all upside, but you don't have to go this far