Tei Jak, Gruul Wayfarer

Partner with Thourah, Flame of the Clans
Tei Jak, Gruul Wayfarer costs {1} less to cast for
each instant card you own in exile.
Whenever you cast an instant spell that targets a
creature you control, exile that card as it resolves.
You may not cast that spell again this turn.
{t}: Add {r}{g}. Until end of turn, you may cast
instant spells from exile.