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Why Most Developers Give Up: The time and resource investment required to solve sleeve detection properly is massive
Like most Pokmon cards, the value of Spearow 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 (Expedition Base Set)
Start off with Birds of Paradise, then Sakura-Tribe Elder, Three Visits, or Rampant Growth, then Cultivate, before finally hitting the big leagues with Migration Path and Vastwood Surge
If a monster(s) you control is destroyed by an opponent's attack or card effect: You can pay half your LP