I'm not sure it's necessary at that. I have a deck with both Troll and Troll bridge in it. Since it's Durable, games with that deck generally have Troll in hand by the end whether I play it or not. Troll bridge is a worthwhile card due to the Dungeon gain even without Troll giving it the attack bonus, though more often than not Troll is already in hand for me when it's drawn.