Synchro Ring

Card type	Monster
Attribute	TRAP"TRAP" is not in the list (DARK, DIVINE, EARTH, FIRE, LIGHT, WATER, WIND, ?, ???, THUNDER, ...) of allowed values for the "Attribute" property.
Activate only by selecting 1 Synchro Monster you control, after it attacked an opponent's monster and did not destroy it in battle. The selected monster's ATK is doubled until the End Phase and must attack once again in a row.

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