Skeletal Devil Dragon

[Thomas★Zero]

Skeletal Devil Dragon
lv 8 Dark
Zombie/Effect
This card can only be Special Summoned from your hand by banishing 3 Zombie or Dragon-Type monsters in your graveyard, it cannot be summoned any other way. This card is also treated as a Dragon-Type monster. Once per turn, you can equip 1 monster from either players graveyard to this card (you can only have 1 Monster equipped to this card at a time.) This card gains ATK equal to the ATK of the monster equipped to it by this effect. If this card where to be destroyed as a result of battle: you can destroy the monster equipped to this card by this effect instead. While this card is equipped with a monster by this effect: this card gains the following effect:
* This card cannot be destroyed or banished by your opponents card effects.
ATK/2000 DEF/1500

[Progenitor]

From where can this card be special summoned?  The hand? The Grave?  Both?  Also it seems slightly overpowered as with a base attack of 2000, even something with 1500 attack will jack this up to a 3500 beater that can't be destroyed once except by card effect and cannot be banished before that one time.  Maybe make it only half of the equipped monster's attack?

[Thomas★Zero]

From where can this card be special summoned?  The hand? The Grave?  Both?  Also it seems slightly overpowered as with a base attack of 2000, even something with 1500 attack will jack this up to a 3500 beater that can't be destroyed once except by card effect and cannot be banished before that one time.  Maybe make it only half of the equipped monster's attack?

Fixed it for the summoning location still the combination of its ATK and effect its meant to go with it being a frightening boss monster. Also remember that outside of destruction effects theirs also effects that can reduce its ATK, change its battle position or Bounce it as well.