What the younger sister suggested was simple, but practical.
Indeed, Rhode had a venue card in his arsenal, which was the only venue card he owned—[Casali under the night sky]. The unique feature of this venue card was that it could drag enemies into the core world of its deck. It was like how a legendary figure could pull enemies into his or her realm but with less pressurizing might. And now, what Rhode needed to do was to use his 'authority' as the Void Dragon and grant [Casali under the night sky] the identity of a 'real world'. As a matter of fact, it was like creating a brand new world, just that the world was only as huge as a grassland. But it was more than sufficient for the current situation. Even though it seemed small, it was still a perfect 'world', wasn't it?
But there were still flaws.