alpha has a black border with really weird rounded corners.
beta has a black border with normal corners.
Unlimited is white bordered and still uses the word TAP.
Revised is white bordered and has a "washed out" look compared to Unlimited.
Private Mod Note
Rollback Post to RevisionRollBack
I am looking for Date Stamped promos from Khans of Tarkir block so I can finish my set. Check my wants if you have any.
Currently offering 2 non-foil Kolighan's Command for a Date Stamped foil!
Unlimited and Revised are white-bordered, and Alpha and Beta are black-bordered. Alpha cards have rounder corners than Beta cards. Revised cards have a black border within the white, while Unlimited cards don't have a border that visible. It's slightly blue, as far as I can tell.
Click on it, and you can choose the different editions you want. This will show you the difference between an unlimited and a revised card. As what the rest said, Alpha has very rounded corners. Other expansions do not have these kind of rounded borders. Both alpha and beta are black bordered, however if you put an alpha card directly onto a beta one, you could still see the corners of the beta card since the borders of the alpha card is typically smaller in area as well, and as said earlier its rounded.