During the Damage Step, in either player's turn, when a face-up EARTH Normal Monster you control attacks or is attacked: You can send this card from your hand to the Graveyard; that monster gains 1000 ATK and DEF until the End Phase.
These are the Gem-Knight EARTH attribute Normal monsters that can benefit from Gem-Merchant’s effect. Gem-Knight Iolite only benefits from the effect if it was still a Normal monster.
Yubel Lvl 50
Yubel Unlock Event
Syrus Lvl 40 (Gate)
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Train Your Kuriboh! Campaign
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Yu-Gi-Oh 5D's Duel Links [From Sep 25!]
How to beat/farm Yubel Lvl50
Jack Altas Unlock Event
How to beat/farm Yusei Fudo
Yubel unlock event: Rise of the Yubel
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Spellbook: deck recipe
How to beat/farm Vellian Crowler Lvl 40 (Gate)
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