Superheavy Samurai Scales

If your opponent controls 2 or more monsters and you control no monsters, you can Special Summon this card (from your hand). If this card is Normal or Special Summoned: You can target 1 Level 4 or lower "Superheavy Samurai" monster in your Graveyard, except "Superheavy Samurai Scales"; Special Summon it in Defense Position. You can only use this effect of "Superheavy Samurai Scales" once per turn.