At the beginning of your combat phase, Duke triggers, giving
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Port Razer haste and myriad until end of turn.
Declare
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Port Razer as an attacker.
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Port Razer's myriad ability triggers, creating a token copy of
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Port Razer attacking each other opponent.
Each
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Port Razer deals combat damage, triggering themselves, untapping each creature you control and causing you to get an additional combat phase after this one for each trigger.
At end of combat, the token
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Port Razers' myriad abilities trigger, exiling them.