That fits blues spellslinger nature perfectly, and thats why Orvar, the All-Form sees a lot of play as a blue commander
The only thing that you can safely trade for in bulk are commons/uncommons for decks (Yanma, Magnemite, Phanpy, etc), or average Trainer cards like Switch, Energy Retrieval, etc
They allow you to apply a special type of processing unlike that of a normal card's Foil Rarity
"A friend of mine suggested it would be a great piece of content with so much room for optimization: feel like a kid again, put on a great show, turn a profit, raise money for charity, and amplify an industry," Paul said
My general philosophy is that you should use your free roll each turn unless the plane you're on is awesome for you