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If you attack with Nightbird and use her bounty ability, can you use steamroll from the opponent's scrap pile?

You can play the Steamroll, however you cannot use it for Nightbird's attack as by the time Steamroll is played, Nightbird's damage was already applied and the defender was already KO'd. If you happen to attack again on that same turn, Steamroll could be usefully applied to an attacker.
Source: Aequitas (2021-06-03)    【Link to Ruling】
Tags: Nightbird, Enigmatic Agent