PokillionaireOnly have 2 days in Japan? The Diamond-tier curated Google Maps list solves this.
Hit only 4.0+ rated shops. 2 days in Tokyo means Akihabara plus Ikebukuro: 70+ shops including Cardon (5/5), Ninnin (5/5), Card Secret (5/5), and Hareruya 2 (5/5).
Most TCG shops open at noon and close at 8 PM. Two days is plenty when you know where to go.