KouriNick raises some good points and there are a lot of options for a Bant Superfriends deck. (add
Narset Transcendent!)
Ideas concerning creatures:
I would definitely add
Reflector Mage, especially since it is a great control source for 3 mana.
If you use
Sylvan Advocate, then you should add
Lumbering Falls, the dual land (G/U) which can become a 3/3 with Hexproof.
Sylvan Advocate will make it become a 5/5 with its ability.
You could also add
Bounding Krasis, to instantly tap a creature your opponent controls, slowing them down enough to play your planeswalkers.
I would agree with KouriNick, remove all the equipment. I know you like them, but they won't help you. You have few creatures which means there is not enough support in the deck to make it playable. (You need to choose the focus of the deck, planeswalkers or equipment)
Personally, your best option is to utilize the token generation that comes from the Planeswalkers. In combination with (2/3)
Westvale Abbey and
Second Harvest you can have 2 great win conditions.
Ideas concerning spells:
I don't really think Call of the Gatewatch is that useful to you, especially since you already have
Deploy the Gatewatch. But
Oath of Jace would be great since you do and because it allows you to scry. On that line, you could use a blue source to allow you to draw.
Anticipate,
Scour the Laboratory,
Contingency Plan. etc.
I definitely would remove
Summary Dismissal! It would removal all your planeswalkers from the battlefield. The best option would be to replace it with
Tragic Arrogance, at least in the situation, your opponent has a better board state you can
balance the board.
An idea could be instead of creatures is to primarily focus on control with your planeswalkers, cards like
Negate,
Turn Aside,
dispel are great for removal like
Transgress the Mind,
Ruinous Path or
To The Slaughter.
Cards like
Ojutai's Command, or
Dromoka's Command are great utility cards. If you want cards from a newer standard set then
Collective Effort would help with removal of Enchantments, as well as creatures. (if used correctly.)
Anyway, I'll let that all sink in for now! Good luck!