Hydralander

The Hydralander (Haidorandā in the OCG) archetype is a group of cards revolving around the mechanics of Elder Dragon Highlander, aka Commander, a format in the popular card game Magic: The Gathering, as well as the concept of the Slivers from the same game. They have no common Attribute or Type, and encompass them all. Each of the "Hydralanders" appear to be mechanical creatures with multiple serpentine heads.

Playstyle
In Elder Dragon Highlander, each player is prevented from having more than one copy of the same card. The "Hydralander" archetype is designed to be played in a similar fashion. They have effects that require that all monsters on the field, in the GY, or both to activate and resolve them. Furthermore, the smaller monsters that do not need to be Special Summoned have effects that they give all other "Hydralanders", similar to the Slivers from MtG. Many of their individual effects revolve around sending monsters to the GY to fill it full of monsters with different names.