Even as a 4-mana colorless instant, this modal spell gets tons of work done for an Eldrazi player
Plus, theres an added layer of making it awkward for opponents to use their mana-generating cards with Treasure Nabber in play, possibly pushing you ahead on resources
Youll also get an oversized Blastoise ex-card for display
Shadowless copies of this card, identifiable by the absence of a drop shadow on the right side of the art window, come from the earliest English print run of Base Set, and in high grade they are legitimately scarce despite Pikachu being a common card
As such, I've slid further into flipping raw singles (cards) until turnaround times have improved at the major grading services
Great Ball can be especially helpful if youre not too concerned what that Pokmon is, or if your deck runs enough Pokmon that youre highly likely to run into something worth grabbing