A Spellcaster-Type theme that manipulates large numbers of Spell Cards.
(Note on Schmitta): A theme that battles choosing whether to use the Spell Cards in your hand to activate Monster Effects or activate the Spell Cards themselves.

A heavy machinery theme that overwhelms the opponent by gathering Xyz Materials.
(Note on Riverstorm): Can take the monsters that are destroyed in battle as Xyz Materials, and use them as the cost to activate its effect. A theme focused on destructive power