Skaeburn, the Devouring Blade

Equipped creature gets +1/+1 for each charge counter on Skaeburn, the Devouring Blade.
Whenever equipped creature dies, put a charge counter on Skaeburn, the Devouring Blade.
Equip - Pay 1 life. (Pay 1 life: Attach to target creature you control. Equip only as a sorcery. This card enters the battlefield unattached and stays on the battlefield if the creature leaves.)