Jamari, Tide of Iron

Whenever Jamari, Tide of Iron or another
creature enters the battlefield under your
control, choose one —
• Attach an equipment you control to that
creature.
• Create a colorless Equipment artifact token
named Hammer with "equipped creature gets
+1/+1" and equip {1}. Attach it to that creature.
"To play the tune of war, the proper
instruments are needed."