Hex, Kellan's Companion
1G
Legendary Creature — Dog
Haste
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.
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.