Swamp [B] — Magic Unlimited Card Value

Which version do you have?

For the cheapest ownership of Swamp, grab the Standard version for $4. The C and B versions offer no significant advantages in this case, as their prices are identical to the Standard version's lower tier. Therefore, if your goal is simply to acquire the card, buy the Standard. Only pay more for the C or B if you specifically prefer those versions for aesthetic reasons, as they offer no tangible collectible benefit over the Standard.