Diluc, Retribution Knight

At the beginning of combat You may Exert Diluc, Retribution Knight, if you do, he gains Haste until end of turn and a +1/+1 counter.
Pyro Reaction-Whenever another Blue, Red,
or Green creature attacking would trigger an ability, Diluc, Retribution knight deals 1 damage to target creature, player, or planeswalker.