You cannot Special Summon " Dragunity Arma Mystletainn" by sending to the Graveyard a " Dragunity" monster that is not being treated as a Monster Card, such as if it is being treated as an Equip Card.
Mentions in Other Rulings
Konami FAQ: Effect Monster > Dragunity Arma Mystletainn
Konami FAQ: Can you Special Summon "Dragunity Arma Mystletainn" by sending a "Dragunity" Equip Card to the Graveyard? ↑ 3.0 3.1
Konami FAQ: Can you use a "Dragunity Aklys" treated as an Equip Card as a Synchro Material?
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