New spoilers:
Ok, So the first thing I notice are that some creatures have a direct synergy with different Planeswalkers. This is an interesting interaction and I think it maybe a first (correct me if I'm wrong). Also we have some spells that have a decent effect and find you a specific Planeswalker. Obviously all the cards are better when you have the respective planeswalker in your deck
Terrain Elemental a very standard green creature with a power higher then its cmc should allow. Not as impressive as some but a very aggressive creature for 2 that will almost always trade up.
Chandra's Pyrohelix is an old school
Forked Bolt with a new name. Always useful and nice to have.
Tezzeret's Ambition makes me
wonder if we are going to see a new Tezzeret Planeswalker card
Impeccable Timing is decent white removal for Standard and even more so in Limited.