Sevro au Barca, Goblin

Whenever you attack with one or more non-Howler creatures, put a +1/+1 counter on Sevro, then create X 1/1 colorless Howler artifact creature tokens that are tapped and attacking, where X is the
number of +1/+1 counters on Sevro.

"This is war, boyo. Murder’s the name of the game. Don’t be sad we’re good at it."