Haste (This creature can attack, and as soon as it comes under your control.) Whenever you cast an Adventure spell, if Hex, Kellan's Companion is on the battlefield or in exile, it perpetually gets +1/+1. Then if it's on the battlefield, exile it with a fetch counter on it. Whenever you cast a spell from exile, if Hex is in exile with a fetch counter on it, put it onto the battlefield.