Savagebound Fiend

Unleash, Soulbond (You may have this creature enter the battlefield with a +1/+1 counter on it. It can't block as long as it has a +1/+1 counter on it. Then, you may pair it with another creature)
As long as Savagebound Fiend is paired with another creature with unleash, if both creatures have +1/+1 counters on them, both Savagebound Fiend and that creature have protection from creatures.