{T}: Add {R} or {W} to your mana pool.
{R}{W}: Boros Keyrune becomes a 1/1 red and white Soldier artifact creature with double strike until end of turn. (It deals both first-strike and regular combat damage.)

• Number: 227
• Rarity: U
• Type: Artifact
• Mana cost: 3
• Color: Artifact
• Artist: Daniel Ljunggren