Zenitsu Agatsuma

Haste, First Strike

At the beginning of your upkeep put a breath counter on Zenitsu

Thunder Breathing First Form - Thunderclap & flash: remove a breath counter from Zenitsu, if a breath counter was removed this way he gets +3/+0 and "when this creature attacks it deals 3 damage to target creature defending player controls." until end of turn.

When this creature dies exile it and return it to the battlefield transformed.