Battlefield Tragedy (BLMR-EN018) [Battles of Legend: Monstrous Revenge]

During your Main Phase 2, if no monsters battled each other this turn: You can discard 1 card; Set 1 "Battlefield Tragedy" directly from your Deck to your Spell & Trap Zone. You can only use this effect of "Battlefield Tragedy" once per turn. Once per turn, during the End Phase, if any monsters battled each other this turn: The turn player sends 5 cards from the top of their Deck to the GY.