Each event in the series has the following special features:
Color restriction
One or more nodes in this event can only be played by Planeswalkers of a specified color.
Locked nodes
Once a Planeswalker has been chosen for a node, it's locked in for the whole event.
Permanent support
A permanent support affects play on one or more nodes.
This event is also notable for having a more limited card set restriction than Standard. This restriction can be called "future Standard", since player decks may be constructed using only cards from the card sets which will be included in the next Standard format: