How many Blue Eyes White Dragons can you have in a deck?

How many Blue Eyes White Dragons can you have in a deck?

Rule 1 of building a Blue-Eyes Deck is to use 3 copies of Blue-Eyes White Dragon, just like the legendary Seto Kaiba. Almost by definition, you'll have the most stylish victories in your community every time you win, and command respect from your Dueling peers like the Kaiba Corp.