what powers does Mass of Ghouls have?

[cubebox]

what abilities does Mass of Ghouls have? It looks different then other creatures?

[Arix]

Nothing. It's just a 5/3 creature.

[cubebox]

why does it look different then other cards

[Kenji]

I thought this would be your next question. Internet, do your stuff!

To tie in with its future theme, the Future Sight set features 81 timeshifted "pre-prints", i.e. cards that have not been printed before but may appear in a future set, also known as futureshifted. Each of the cards features some quality that has never appeared in the game before, such as a new keyword ability (Fleshwrither), the application of a new keyword for an old ability (Thornweald Archer), or even referencing cards and card types that do not exist yet (Goldmeadow Lookout, Steamflogger Boss). Each of these unique aspects appear on only a small number of cards, indicating that they may be more properly explored in later sets.

Additionally, most of the cards in some way reference unexplored planes, hinting at potential themes and locations for upcoming sets. The cards also feature a new "futuristic" card frame to hint at potential changes to the layout of Magic cards and to denote which cards are actually timeshifted. However, it has been confirmed that the Future Sight frame will not become the norm for subsequent sets.
The cards are distributed haphazardly in booster packs, with each booster containing somewhere between five and ten timeshifted cards. As with Planar Chaos, the cards have the standard colored rarity symbols.

The relevant part is bolded. Basically, it was just a fun thing they decided to do with the so-called "future" cards. You'll note that when Mass of Ghouls was reprinted in Tenth Edition, it had normal borders, just like the rest of that set.

[Void Elemental]

It does have the ability to look pretty awesome.