Unlike the Dialga ex and Yanmega archetype that relies on high Energy, high damage, this deck relies on small damage done more often for little Energy
More than anything, these moments seem to be self-perpetuating, where everyone gets tremendously excited about one particular card, which creates demand, which raises the price, which exaggerates the rarity, which creates demand The next most expensive right now is the Latias ex at almost $200, then the gold card version of the Pikachu ex at $100, and that Hydreigon pictured above at about $95
In practice, many of the Tyranids play similar to the hydras that use X mana costs
2 Jolteon Star (Ultra Rare) $484.50 Jumping Into A New Stratosphere If you were impressed with Flareon, then one of the most valuable Jolteon cards ever will shock you, as this Electric-type Pokemon leaves Flareon in the dust