Each deck has its own featured, Mythic Rare card that uses specific mana colours that the decks are based around: the Green and White Byrke, Long Ear of the Law and Blue/Red Bria, Riptide Rogue cards, as shown below
FOR THE LOVE OF THE GAME Admittedly, all of this is a lot of extra effort and complication compared to just making a bunch of resources and comboing off
It hits hard, it hits right away, it is massive, it has all the right evasion and it even has some mild ability to protect itself
Channel demonstrates the extreme ceiling of green mana acceleration better than almost any other green spell
No word on when open beta begins
But in terms of what digital-only cards could do, Seek, Perpetually, and Conjure actually seem like they fall on the tame end of the spectrum to my eyes