carnivine pokemon card - Mega Evolution - Ninja Spinner - Placeholder Image Provided CARNIVINE Pokemon Uncommon Platinum Card

No, there is no Basic Colorless Energy card

If you're using Urza, Lord High Artificer, infinite mana combos are more useful than infinite sacrifice combos

Base Set classics remain stable with slight increases

Sealed packs of older sets can fetch quite the pretty penny on the secondary market, but luckily online storefronts like TCGPlayer and Card Kingdom are easy ways to buy the single cards you need online

If you only scan a few cards per month, free may be enough

Do you mean make a living off of it, or would you also call selling to supplement income to build your collection a success (or, even better, building a collection for free by offsetting costs via selling)