Lots of powerful cards. We're probably going to sit out multiple bans again in the next few years.

Rishadan Porthand is going to be annoying as fuck. Trading mana 1vs1 is much more powerful than 2vs1.

Grief is obviously powerful and much better than Unmask in fair decks.

Timeless Dragon is an extremely powerful addition to white Stompy decks. I've screwing around with Angel of the Ruins/Eternal Dragons lately and this is a straight upgrade to Eternal Dragon. Having land cyclers makes Mox Diamond much more viable. Hell, even color splashes become more feasible with a land cyclers + Mox Diamond - Hullbreacher or Opposition Agent/Plague Engineer or Ramunap/Dryard come into mind. I do have high expectations at this card. You can now easily do something like this:

T1: Sol Land, cycle Dragon
T2: Land, Mox Diamond, Eternalize

You now have 4 mana (unless it was City of Traitors) and a 4/4 flyer in play - at effectively zero card disadvantage.