Sir Silverblood, the Pledged

Oathbound (Pair this card with a non-legendary creature of your choice. That creature and Sir Silverblood, the Pledged are your commanders for the rest of the game. Spells that may target one of these creatures target both of them instead. You must have Sir Silverblood, the Pledged on the battlefield in order to cast the paired card.)
Sir Silverblood, the Pledged enters the battlefild with X +1/+1 counters. If X is 5 or more, Sir Silverblood, the Pledged and your paired commander gains hexproof.