You have to buy cards the same way you would IRL, but theyre much cheaper
While Prodigy's Prototype offers a unique ability to create Pilot tokens and boost the crewing power of Vehicles, it may not be as efficient as other options like Depala, Pilot Exemplar, which provides additional benefits for Vehicles and Dwarves in a similar deck archetype
The main purpose of posting this is because it offers perspective
Into the Flood Maw Into the Flood Maw is a more flexible Unsummon, and at its strongest, the adventure half of Brazen Borrower
4 Greninja ex: Crimson Haze (Special Art Rare) $139.27 A Blaze Of Color Greninja ex's Japanese price chart mirrors its English counterpart's trajectory, as this card debuted at TCGplayer around the $120 mark and has only increased since then
I don't know if I agree it's a card you NEED, but if your Commander deck is specializing around Goblins, this card is something you are going to need and want