Hero Signal is a Rare Trap Card card from Yu-Gi-Oh! (Dark Revelation Volume 3, DR3). Current market price: $0.07.
Rare
Dark Revelation Volume 3 (DR3)
Card Text
When a monster you control is destroyed by battle and sent to the Graveyard: Special Summon 1 Level 4 or lower "Elemental HERO" monster from your hand or Deck.
