Heroic Challenger - Thousand Blades

“Once per turn, if this card is in Attack Position: You can discard 1 "Heroic" card; you cannot Special Summon monsters for the rest of this turn, except "Heroic" monsters, also Special Summon 1 "Heroic" monster from your Deck, and if you do, change this card to Defense Position. When you take damage while this card is in your Graveyard: You can Special Summon this card in Attack Position. You can only use this effect of "Heroic Challenger - Thousand Blades" once per turn.”