You can Set this card from your hand to your Spell & Trap Card Zone as a Spell Card. During your opponent's turn, when this Set card in the Spell & Trap Card Zone is destroyed and sent to your Graveyard: Special Summon it. During your opponent's turn, each time an "Artifact" monster(s) is Special Summoned: Draw 1 card. You must control this face-up card to activate and to resolve this effect. You can only control 1 "Artifact Caduceus".