The box is from a very low-print run, and Heritage says the fact that it was actually sealed with no visible damage explained " why the demand for it was so intense
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Key words here are pre-sale prices
For example, Complains Clerk has "Whenever you roll a 1, create a 1/1 white Clown Robot artifact creature token." If you choose that ability, you ignore everything up to the first comma, ending up with "Create a 1/1 white Clown Robot artifact creature token." Some triggered abilities have an "intervening if" clausethat is, they are written in the form of "When/Whenever/At [trigger event], if [condition], [effect]." If you choose such an ability with Trigger Happy, you ignore the trigger event, and the ability will go on the stack even if the intervening if condition is not fulfilled, but the ability will still check the intervening if condition as the ability tries to resolve
When you factor in Eevee and Pikachu as two of those Pokemon, it's easy to see why this is the most valuable Glaceon of all time.