Reprisal
Fifteen cards. Three to a raid. Every team you attack with becomes a wall someone else has to break.
Reprisal uses your AutoBattle account. Signing in keeps your pool and your place on the ladder.
A guest is a real player with a real ladder position — it just lives in a cookie on this browser rather than an account. Clear your cookies and it is gone, so sign in if you want to keep a rank.