原文If some of the attacking creatures leave the battlefield while Mangara's triggered ability is on the stack, use the player or planeswalker they were attacking before they left to determine whether you draw a card. On the other hand, if they're removed from combat without leaving the battlefield, use their current information to determine that they're not attacking you or a planeswalker you control anymore.
原文An ability that triggers when a player casts a spell resolves before the spell that caused it to trigger. It resolves even if that spell is countered.