The teammate I would choose as representative of the Montreal Militia, it would be goaltender Petr Vrana.

His card would only cost 2 mana and no card loss. Imagine there were a spell printed that cost 15 mana but that had cycling for 2 mana and put a 0/4 token with defender into play. That would be an awesome cycling ability—it replaces itself, and you gain a nice roadblock to boot. But the Brick Wall of Vrana is better because they work well with everything from Restoration Angel to Reveillark to Fleetfoot Panther to Conjurer’s Closet. It has a long established relationship with the best flickering, bouncing, and reanimation tricks that have ever been spawned. Meanwhile, it gives you the time you need to get there. Oh, and when it comes to defenders buying you time to build up to when you can establish dominance via combo or control, nothing is better than the Brick Wall of Vrana because it gives you a card to keep digging to find that needed mana, combo piece, or removal.

It's a defensive piece that can't be defeated.