All of the cards are powerful, but they are also restricted to tribal decks (unlike the secondary commanders that we'll talk about in a minute)
What affects the value of Inti, Seneschal of the Sun
Quest for Ulas Temple can get a counter, you can set up Sapling of Colfenor for a massive attack of life gain and draw the card, you can find abilities for Skill Borrower, play it with Garruks Horde, haste it out with Impromptu Raid, find a use for Descendants Path, and so forth
Vintage kept its restricted list, because some people wanted to play with powerful cards (and also because Type 1.5, aka legacy had started to take root, which, at the time, was just vintage with the restricted list renamed "banned list"), but in standard, you already couldn't play with all your cards, so there really wasn't any good reason to keep a restricted list
Open your boosters and find out Each booster pack contains one of 121 possible card lists so there are over 14 000 possible 40-card decks