While its also a Clever Concealment/Teferis Protection/Deflecting Swat et al deck too, Akromas Will is still my first pick because it helps you get in and finish people off with your lower curve value engines
Once per turn, this Dragon can negate any effect activated by your opponent on the field
Sabrinas ESP Allows you to attach the card to a Pokmon with Sabrina in its name and re-flip all coins once more if your attack calls for flipping coins
While the autograph certainly adds a unique edge, the art itself is fairly standard, at least on these first two examples
Its biggest TCG strength is that any Energy Type can be used as a Colorless Energy requirement to use any moves
This is easily solvable while curating a Cube, but its something to consider, and a reason that Mahadi wont be able to immediately slot into a lot of Cubes