I'm thinking that you down with the sinister 3
Alliance so deadly, lies - complete medleys

from Psyonik (Ft. Isaiah G) – Immortal Kombat Lyrics on Rap Genius

Meaning

The Sinister Three would refer to the alliance of Shao Kahn, Shang Tsung, and Quan Chi at some point; the Deadly Alliance would just be the latter two, Shang Tsung and Quan Chi.

These three wreaked generations of havoc on the MK Universe, and to team with them would bear all about the true treachery of a person.

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