yugioh legacy of the duelist synchro deck - Yu-Gi-Oh! Card Database Yu-Gi-Oh! Legacy of the Duelist:

Gyarados takes 20 additional damage from Lightning-type attacks

You can only use this effect of "Gallant Granite" once per turn

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A number of lands sacrifice themselves for a burst of bonus mana, which both cast Sky Swallower faster and leave less behind for you to give away