Bond of Friendship
The Fortress of Nurn #147 (x1)

Your deck must be exactly 50 players cards and include exactly 10 cards from each of these four spheres: and You cannot include more than 2 copies of any card by title in your deck.

When choosing your starting heroes, you may choose 4 heroes instead of 3. Each of your heroes must belong to a different sphere.

"You can trust us to stick to you through think and thin – to the bitter end."
–Merry, The Fellowship of the Ring