Steadfast Guard

No price for this printing yet. That is not the same as worthless — the feed simply has no listing for it.

Is this the one you are holding?

The bottom edge of your card should read 10E 48★. There are 2 other printings of Steadfast Guard, worth $0.11 to $0.17. See all of them.

Same name, different printings. The set code and collector number printed along the bottom edge are what tell them apart.

Not sure which one you are holding? OtterDex reads the set code and collector number off the card and tells you.