Just make a cerberus deck with Yugi's sorcery conduit skill, then you can easily start farming lvl40 Tea, Rex, Weevil, Odion, and with a slight tweak Joey.
Any lvl40 LD farm will optimize chances of DD drop. Agreed Rex is the easiest, but others pretty easy too and you might want to farm cards at same time.
Anoymous
Regiultima