Hardened Armed Dragon - RGBT-EN083 Secret Rare 1st Edition

(This card is not treated as an "Armed Dragon" card.) You can Special Summon this card (from your hand) by sending 1 Level 8 or higher monster from your hand to the Graveyard. If you Tribute this card for the Tribute Summon of a Level 7 or higher monster, that monster cannot be destroyed by card effects.