Spoiler warning. This page gives away the puzzle from 21 October 2025. If you have not played it yet, try it first – five guesses, and it is still there.
An honest spirit that boosts light monsters during battle.
Type: Effect Monster
Set: 25th Anniversary Tin: Dueling Mirrors
CardMarket price: 0.11$
Text: During your Main Phase: You can return this face-up card from the field to the hand. During the Damage Step, when a LIGHT monster you control battles (Quick Effect): You can send this card from your hand to the GY; that monster gains ATK equal to the ATK of the opponent's monster it is battling, until the end of this turn.