Test Proof cards that are proven to have been printed and fully cut in the facility, with corners, can be assigned a numeric grade and are not required to be "Authentic" only
Oran-Rief, the Vastwood won't always work, but it's great when it does, and Kessig Wolf Run is a fun use of excess mana should we have it
The rest are reprints
As we see in Viral Spawning, this turns on the flashback portion of the card, giving you a slight discount from Call of the Herd at three mana
the strength of their effects, combined with the versatility of evoke, makes them especially valuable in singleton formats
Card values can go down, but not as near to zero as is possible when bad news befalls active athletes