DNA

DNA Cards
DNA cards are a series of trap cards (and one spell card) that were first introduced in Pharaoh's Servant and kept going on, the latest is DNA Checkup which was released in Crossroads of Chaos.

Playing style
DNA cards focus on changing types and attributes of monsters this can come in handy if you play cards like System Down which removes from play all machine types. Cards like these come are only used in combos.

Appearance
DNA cards have Doctor with three eyes two nurses next it doing something to the patient.