yugioh zombie cards list 5D's World English Structure Deck : Toys & Games History of the Meta -

You may put a Dragon creature card from among them onto the battlefield

Some blue ramp cards might perform better against specific decks or strategies

Empirically we have in the format the use of 35 to 37 lands added to 10 or more ramp, many of them artifacts, and other resources able to correct the colors inside our mana curve

Duel Monsters 4: Battle of Great Duelists (which both use the manga stats for these monsters), this monster has 2300 DEF

As a reminder, here is the pertinent Oracle text for it: A deck can have any number of cards named Relentless Rats. Well, it seems from the wording, rulings, and rule that it would not be allowed in multiples, but Sheldon, a couple of years ago, made this post in the forums: The RC has discussed it and for the time being thinks that multiple Rats is OK