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So what happens when your opponent is tapped out and you attack with Blackwing/Dreadwind and combine at the end of your turn? Your attack step is over, right? Can you not attack with Dreadwing the turn he comes into play in that case? Does your opponent take a turn and not attack because their characters are all tapped, or do you have to attack with Dreadwing the turn he comes into play since your opponent is tapped out?

Because your turn is over and youre past the attack and untap steps, you cannot attack again.
Source: Wizards of the Coast (2019-02-18)    【Link to Ruling】
Tags: Dreadwing