when i attack with a preeminent captain and play another one, does the ability of the one i played work because it's attacking? the text says whenever it attacks.....
No, when a card says "When [this] attacks... it means, when [this] is declared as an attacker... So the second Captain magically enters play already attacking and thus the ability does not trigger.
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Nitpick: You put it into play, not play it.