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It has the effect of getting his ATK 200 times the level of that monster, and the effect of releasing Effect Monsters to Special Summon Normal Monsters

Ashiok, Sculptor of Fears Breaking // Entering Codex Shredder Coerced Confession Curse of Unbinding Dread Summons Duskmantle Guildmage Extract from Darkness Fleeting Memories Flitting Guerrilla Geth, Lord of the Vault Guild Feud Gyruda, Doom of Depths Halo-Charged Skaab Helm of Obedience Jace, Telepath Unbound Koma's Faithful Lost in Space Overwhelmed Apprentice Patient Rebuilding Persistent Petitioners Petra Sphinx Psychotic Episode Ringskipper Sanity Grinding Screaming Swarm Startled Awake Syr Konrad, the Grim Tasha, Unholy Archmage Telemin Performance Town Greeter Uncharted Voyage Undead Alchemist Vanish from Sight Vexing Arcanix

As long as someone just died, of course

These are: Black Lotus, The Moxen, Time Walk, Timetwister, and Ancestral Recall