The Pikachu EX, Latias, and Milotic cards give it standout SIR potential, and the sealed box has held firm on the secondary market
I expect you to be able to use it in most situations you would want to do so with relative ease
Valuable Art Cards Yes, art cards , those throwaways that one person at your LGS collects, the ones that are randomly inserted into Play boosters in place of those advertisement cards that tell you how to play a format that literally no one's ever played before
For enchantments, Force of Vigor or Wear // Tear are excellent choices, offering instant-speed interaction
It always is nice to have a free snack and drink too while you are hunting
Legacy is tough because three reasonably common suggestions for unbans here run straight into the Reserved List : Library of Alexandria, Survival of the Fittest and Earthcraft