Litmus Doom Swordsman (BLRR-EN013)

You can Ritual Summon this card with "Litmus Doom Ritual". It is unaffected by Trap effects and cannot be destroyed by battle. Gains 3000 ATK/DEF while a Trap is on the field. If this Ritual Summoned card in its owner's control is destroyed by your opponent's card: You can target 1 Trap in either GY; Set it to your Spell & Trap Zone.

Warrior / Ritual / Effect, Battles of Legend: Relentless Revenge