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What affects the value of Those Who Serve

A face-down creature that was cloaked or cast with disguise has ward

Yeah, it technically gave red something it's not supposed to have, but the spell in a larger sense gave red something it is supposed to have

maybe you can send a decklist my way and help me out

Their Ability, Violent Appetite, lets their trainer heal them for 60 HP when discarding a pokemon card from one's hand, allowing Naganadel & Guzzlord to stay on the field even longer than normal

In addition, this special summons a level 4 monster for you to use next turn, as well as potentially weakens your opponents monsters by putting them into defense position