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4 THOUSAND KNIVES A normal spell usable if the player controls a face-up Dark Magician monster, Thousand Knives destroys a monster the opponent controls

If you really want to commit to the Sirens Call and Angels Trumpet idea, you can springboard off the Mandate of Peace idea and just play Peacekeeper and other cards that prevent creatures from attacking

You get an emblem with "Whenever you cast a red spell, this emblem deals X damage to any target, where X is the amount of mana spent to cast that spell." +1: Exile the top card of your library

Between all the effects of this theme to return to hand or Special Summon, duels can really become a runaway as you snowball advantage