The main reason for its lofty price is scarcity
Life drain, token doublers, and mana engines all multiply in value with more players at the table
"Routinely, we see Pokmon cards sell for over six figures," he said
It is a 2/2 Legendary Merfolk Wizard creature that costs 1 blue, 1 green and 2 generic with the following abilities: Ward 2 If one or more tokens would be created under your control, twice that many of those tokens are created instead This is a really neat card
Untapping an attacking creature doesn't remove it from combat
While normal old-border cards are easy enough to calculate (you'll open one per pack, and many vendors have presales listed, so we can easily find prices), foil old-border cards are a problem since they are extremely rare and major vendors aren't preselling them, but more on that in a bit