When you get targeted by a spell you roll a d20, If you get a Nat 1 you roll the Sorcerer's Wild Magic Table and the spell caster is forced to surge....if you roll a Nat 20 then you get a magic token, Every magic token allows you to add +1 to any roll, you can put the magic tokens into the "other possessions" section of the DND beyond character sheet. Magic tokens are consumed on use, also yes you can use these so you dont surge on your party members, unless you want to. cause thats funny