4 or more of this card in your deck

4 or more of this card in your deck is an ability that first appeared in DMR-12 Episode 3: Omega Climax.

List of cards that can have 4 or more copies in a deck
 Light
 * Newee, Guerrilla Division
 * O.HA.NA.P

 Water
 * Aquaarmy, Guerrilla Division

 Darkness
 * Butch Beads, Guerrilla Division

 Fire
 * Chorochu, Forty Body
 * Nikka, Guerrilla Division

 Nature
 * Prepre, Guerrilla Division
 * Wanwanwan, Wankorage

Trivia

 * Due to it first appearing on a mouse card, as well as being based on Relentless Rats from Magic: The Gathering, it is sometimes known as "Rat Ability".