Edison format ruling
Hardened Armed Dragon
Card effect (current official text)(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.
Rulings
(U1) You can send 1 Level 8 or higher monster from your hand to the GY and Special Summon this card. (U2) If you Tribute this card for the Tribute Summon of a Level 7 or higher monster, that monster cannot be destroyed by card effects.
- The (U1) Unclassified effect is a built-in Special Summon. This does not start a Chain.
- This can only be used to Summon this card from the hand.
- Sending 1 Level 8+ monster from your hand to the GY is a cost.
- The (U2) Unclassified effect does not activate. It applies to the Tribute Summoned Level 7+ monster.
- This effect applies even if Skill Drain negates the effects of the Tribute Summoned monster.
- If this card is Tributed to Summon Earthbound Immortal Aslla piscu while there is not face-up Field Spell Card on the field, Earthbound Immortal Aslla piscu will not be destroyed by its own effect.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Edison forum — sourced change requests get reviewed.