This is pretty cool idea. Turn pk war room to GS streak room and only allow 5v5. How about bring back the old token system? Your guild gets a token each time your team wins and your guild leader can purchase a guild decoration from the shop with guild tokens. To prevent token hoppers, make sure tokens are stored to guild itself (individual can't earn tokens from guild hopping). A strong guilds like Alumni could possibly dominate all day. So set the maximum streak up to 50. This also encourage spar guilds to stick more together as a group.