User blog comment:Otakon7/Otakon7's Buddyfight Simulator/@comment-10858287-20170912200253/@comment-28173866-20170912201148

If i recall right, the sim automatically logs you out if you take too long in the build section. My advice, plan your deck here on the wikia, then build it in the sim. It's way clearer and you avoid the time out.