Heavier than it looks, tricky to wield, guaranteed to last.

Double Masters

Darksteel Axe

Indestructible
Equipped creature gets +2/+0.
Equip {2} ({2}: Attach to target creature you control. Equip only as a sorcery.)

Indestructible (Effects that say "destroy" don't destroy this artifact.)
Equipped creature gets +2/+0.
Equip {2}

Indestructible
Equipped creature gets +2/+0.
Equip {2}

Darksteel Axe is indestructible. (Effects that say "destroy" don't destroy it.)
Equipped creature gets +2/+0.
Equip {2}