Coltras, Sojourner

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
Magical 1 ({t}: Add {u}. Spend this mana only
to cast instant or sorcery spells.)
Whenever you cast your first instant or sorcery spell each turn, untap Coltras, Sojourner. Draw a card, then discard a card.