RD/KP11-JP050 ロードアームズ－セブンス・ランス Road Arms – Sevens Lance
Equip Spell Card
[REQUIREMENT] If you do not control another face-up “Road Arms – Sevens Lance”, you can equip this to 1 face-up “Sevens Road Magician”.
[EFFECT] The Equipped monster gains 400 ATK x [The number of different Attributes in your GY] and that monster cannot be destroyed by the effects of your opponent’s Trap Cards.

Source