Show last, last two or last three nodes depending on role
Create a fresh (block) view that displays all nodes.  Then you can add a relationship to Content: Author.  

After adding the relationship, you will be able to add a new filter for User: Roles that uses the Author relationship.  Set this filter to your Gold member role.  Set the view to display 3 items.

Add a new Attachment display:


Under attachment settings, attach it to your first views display (the gold member display).  Attachment position should be "After".  Set the User: Roles filter to show Silver members and set the "Items to display" to 2 items.

Add another Attachment view and repeat the last steps, setting the User: Role to Bronze and changing the Items to display to 1.

Now when you view the block, it will show 3 gold, 2 silver and 1 bronze node.