Effect
During the Damage Step, when a face-up monster you control battles (Quick Effect): You can send this card from your hand to the GY; that monster gains 300 ATK until the end of this turn.
The effect of "Master Craftsman Gamil" is a Quick Effect that activates in the hand.
This effect does not target.
When activating this effect, send this card from your hand to the Graveyard as the cost.
You can activate this effect at any time from the start of the Damage Step until before damage calculation, whether your monster is attacking your opponent directly or battling an opponent's monster.
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