If you have no Spells/Traps in your GY, you can Special Summon this card (from your hand). You can only Special Summon "Superheavy Samurai Stealthy" once per turn this way. If you have no Spells/Traps in your GY (Quick Effect): You can Tribute this card, then target 1 Spell/Trap in your opponent's GY; Set it to your field, but banish it when it leaves the field. You can only use this effect of "Superheavy Samurai Stealthy" once per turn.