Most of them have been spoiled by the passage of time
Essentially a hastened Rummaging Goblin, you get access to madness costs on your spells with very little effort, with the main upside being that you will have a dedicated way to fill your graveyard with cards that want to be there, right from the command zone
The next question: how do they mechanically interact with Dragons
Gev, Scaled Scorch Persist combo was fun in Gruul with Grumgully, the Generous and it's even more fun in Radkos with Gev
Among some of the other cards that have already revealed, theres also a brightly-colored Mega Gengar ex, Ns Vanilluxe, and Entei, all of which sport some extremely attractive artwork
There are many interesting and tricky interactions when dealing with the graft mechanic