Argostars - Slayer Eteo (SUDA-EN073) - Supreme Darkness 1st Edition

While this card is face-up in the Spell & Trap Zone, Warrior monsters you control cannot be destroyed by card effects. Once per turn, when your opponent activates a card or effect: You can Special Summon this card as an Effect Monster (Warrior/LIGHT/Level 4/ATK 800/DEF 800) with the following effect (this card is also still a Trap), then if you have a banished "Argostars" monster, you can return 1 card on the field to the hand.
• Once per turn (Quick Effect): You can place this card face-up in your Spell & Trap Zone.