[quote=@LukasVolkov]
So is the idea to make Masters then summon the Servants above? 
[/quote]

Yes. Every player will choose which one they'd like to have, if two people want the same Servant (Barring Lancer due to being held by a returning player) they will roll off to see who receives that Servant for fairness. The loser will choose another, and this will repeat until everyone has a Servant.