They have a black inked strip across the middle of their cards
We haven't gotten a taste of any of these yet but they're sure to be something special
Although both of these effects are useful, theres no real synergy between them, beyond the fact that they are both vaguely Control focussed effects
In fact, he does this himself as one of the options
Evra Voltron This Evra, Halcyon Witness deck is my attempt to make a budget version of Johannes Voss's Evra list which I had the pleasure of being destroyed by at MagicCon Barcelona: Johannes multitasking between piloting this deck and signing cards and ended up with an absurdly high win%, which was incredibly impressive for a commander that most people overlook as "weak"
When you look into blue, you find a lot of great cards, that return lands to your hand, most of which are generally useful to some degree