Declare Shredder as an attacker. Shredder's first ability triggers, creating a tapped and attacking copy of it attacking each other opponent that isn't legendary.
Deal combat damage using the Shredders. Each Shredder triggers, causing each opponent to lose half their life total, rounded up.
At the beginning of your end step, Wound Reflection triggers, causing each opponent to lose life equal to the life they lost this turn. Each opponent then loses the game due to having 0 or less life.

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