I think the
Reflector Mage ban is to keep WU
flash under control, since with the banning of Emmy and looter scooter, it would be too powerful and/or have too great a share of the meta.
I don't much care for either Modern banning.
Gitaxian Probe has issues, but I think
Fatal Push is a great answer to Infect,
Death's Shadow, and UR
Kiln Fiend. It would've been nice to see how it played out. So long Storm and YP-Delver variants.
I think
Prized Amalgam was a bigger issue in Dredge than Golgari-Grave Troll, but we'll see (just make sure any data takes into consideration the increased GY hate since it's
rise to power, not just the GGT ban).
I'm a bigger fan of unbans than banning though. I'd love to see
Preordain,
Stoneforge Mystic, BBE, and maybe even Twin (along with an Exarch ban) come off the list.