So the board is 1 Grimlock on Player 1s side and a Metroplex and Scamper on Player 2s side. Player 1 attacks Metroplex since Scamper is untapped and unable to be targeted. Then Grimlock gets enough attack to kill both characters with skill since Metroplex is heavily damaged and Scamper has low defense and life. So, since the Grimlock attacked Metroplex while Scamper had Heroism, I assume that since Heroism only changes where the damage goes and not the actual attack that the damage a character takes through the effect of Heroism is effect damage and not battle damage. I want to know the ruling because if the damage IS battle damage then Grimlocks skill does trigger and Player 2 loses, since Scamper would die as the rollover would kill Metroplex but if it is effect damage, then Grimlocks skill wouldn't trigger and only Scamper would be KOd.

The damage redirected by Heroism is still attack damage. So Scamper would take enough to get KOd and then Grimlocks ability would trigger and the defender would have to assign the extra damage to Metroplex.

Source: Wizards of the Coast (2019-02-11)    【Link to Ruling】

Tags: Heroism