or, since planeswalkers received errata to be legendary, Elspeth, Suns Champion
I think the foil lends some credibility to the conclusion that Bastion may be a bit overpriced, but I think they both go up from here
Another option to consider is bigger ramp, maybe Thran Dynamo, which takes you from 4 mana to enough to cast your Commander next turn, seems decent
Specializing in a specific card niche helps build expertise and a loyal audience for more profitable direct sales
I have already seen people say the card is too good for Modern by making it too easy to interact with the board, while I think that slower Midrange and Control decks finally have the chance to interact with your opponent, which is the best thing which could happen to Modern in the long run