Cool Card Design of the Day
2/15/2017 - There's a solution for making the legendary supertype meaningful in a positive way, it's just years too late to implement: Spells that reference your legend are improved while it's in play. Maybe they all cost a little less to cast, or they all have some kicker, or a wild variation of benefits.
We could today implement a new across-the-board rule that any spell with a legend's name in its own costs {1} less, but Wizards doesn't like to mess with cardnames-matters because of variations due to printing across languages. In theory, proper names should be consistent within a given language, but there are still a number of issues, probably including: Cardnames that share a word or word-part in common with a legend's name but were never intended to be related; cards that were meant to be related but do so by art or flavor text and not by name; cards with no generic mana in the cost.
Anyhow, here's a custom card based on the idea: