This is a playtest or proxy card with customized art on the back to help differentiate it.  It is ideal for such things as
*Casual groups that are ok with such cards
*Tournaments explicitly that allow playtest cards
*Testing out cards before buying them
*Using in place of cards to preserve their condition
*Enjoying the customized art
*Fun or casual experience

Shipped to you in a sturdy, reinforced mailer with tracking.