I also wanted to mention that if someone has a majority of teams on the card on multi-player cards (over 50%), they will win the card and it will not be randomed.
You have to have a majority of the teams on the card. Examples: 3 way auto/relic you have 2 guys. 4 way auto/relic you have 3 guys. 6 way auto you have 4 guys. 8 way auto/relic you have 5 guys. If you have 2 out of 8 you have 2 chances out of 8 in the random.
All randoms are performed by moderators.