@kleaners - You don't need to attack. You have a Carrion Feeder, 4 Disciples of the Vault, 3 Ornitopters, 3 Shield Speheres, and 2 Phyrexian Walkers. When you sacrifice all of the Artifact creatures (8 creatures) to Carrion Feeder, each of them will trigger each of the four Disciples. 8 artifacts, and 4 disciples, that's 32 damage, before anything else has the chance to happen.
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