Ugh, another weak pack. Valakut Invoker seems like the obvious pick, best card in the pack by a fair margin and relatively on-color. I'm happy to have one of these in any R/x deck, as they are passable on turn 3 and can randomly win games that go long (especially against UW). Even good as a splash if we end up UGr with some ramp.
Picks so far:
P1P7: