Lieam, Heir to The Black Axe

Other Mice you control get +1/+1.
When Lieam, Heir to The Black Axe enters, create The Black Axe, a legendary colorless Equipment artifact token with "Equipped creature gets +1/+1 and has vigilance, trample, and haste" and equip {2}.

"It matters not what you fight, but what you fight for."