You can buy a moderately played version right now for $79k
These 4 then appeared again on the 2016 Champions Festival card
Even if Im just using Devious Cover-Up to recycle my library, I like the idea of splashing a good planeswalker, and Vraskas a little easier on the mana than Teferi, Hero of Dominaria, but Teferi might still be a better option, since the manas pretty easy for a small splash like that anyway, thanks to surveil
Charizard ex - 223/197 - SV03 Surprised
If a player is allowed to bring a card from outside the game into a Commander game, that player can't bring a card into the game this way if it has the same name as a card that player had in their starting deck, if it has the same name as a card that the player has already brought into the game, or if any color in its color identity isn't in the color identity of the player's commander
Ideally, it's great to have a whole mechanic or two that can do it