Superheavy Samurai Prepped Defense

Kartentext

Cannot be Normal or Flip Summoned, if you have any Spell/Trap Cards in your Graveyard. When you take battle damage, if you have no Spell/Trap Cards in your Graveyard and this card is in your hand: You can Special Summon this card, and if you do, it cannot be destroyed by battle or card effects this turn.