one piece booster box Japanese TCG: One Piece Card and there are even some rare parallel edition DON BANDAI - ONE PIECE TCG

The most common is upgrading your cheap artifact into Blightsteel Colossus although many fat threats get the Tinker treatments from Sphinx of the Steel Wind to Sundering Titan to Myr Battlesphere to Inkwell Leviathan to the comparably small Wurmcoil Engine

The extended-art foil version is worth the most money now, priced around $65 to $75

(Look at the top two cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.) Ravnicas safest strongholds are often neither

While this makes the cost increasingly worse as the game goes on, it still seems like a reasonable expectation and would be a bit too strong and consistent if it was always so cheap to get a better version of your commander out turn after turn