Ero, Decorated Champion

Heroic — Whenever you cast a spell that targets Ero, Decorated Champion, put a +1/+1 counter on it.
Spells you cast that target Ero cost {1} less to cast for each +1/+1 counter on it.
Spells your opponents cast that target Ero cost {1} more to cast for each +1/+1 counter on it.
"When the crowd cheers his name, it's over."