Mon and Dar

Whenever you cast a Viking creature spell, put X +1/+1 counters on it, where X is Mon and Dar's power.
Whenever you cast a Instant/Sorcery spell, put a +1/+1 counter on Mon and Dar.
After Mon and Dar were exiled from Teras, they fled to the Northlands, seeking a new life. Not many know why they were exiled, but it may have been for their powerful magic.