CommentStreams:8c7a74761999c7630c59da3921d9b0bc

Judging by how every purchase is giving you lots of medals, I'd guess the top 10 guilds will be the wallet warrior ones, then the rest will be based on how high is your total power (how many cards have you got) and how frequently you login (daily logins will likely be necessary for the best guilds).

The overall design is probably to shift away from monthly events (which are expensive to run - you need an artist and a game master) to a more self sustaining PvP model. They would need a chat feature for that to work though.