Warleader's Call - 242 R MKM

Creatures you control get +1/+1.
Whenever a creature you control enters, this enchantment deals 1 damage to each opponent.
While Aurelia mustered the Boros Legion, Kaya and Kellan raced against the clock, desperate to stave off a war the guilds might not survive.
rare
Enchantment
From the Magic: The Gathering set Murders at Karlov Manor.