Perhaps the greatest challenge of these cards is that instead of unlocking broader deck building capabilities, they acted like a walled garden forcing players to only include them in decks that run the two Ink types the card possessed
Having access to all five colors means you can run Maelstrom Nexus and Yidris, Maelstrom Wielder, making good use of red cards like Rain of Riches and Volcanic Torrent
When it comes to planeswalkers in such limited colors youre basically playing the top 20
It really speeds up your stuff and is massive ramp that gets better the longer you drop it, but just four or five on turn 2 or 3 when you drop it is still pretty good
Then if cast from exile you'll also gain twice that power's life - great for saving yourself and then free in Type Four where you have infinite mana but just one spell per turn barring alternate costs like Force of Will or this
We do have cards for the whole crew now though, thanks to the reveal of Avatar Aang in June, but we'll have to wait and see what else Wizards of the Coasts is hiding away for now