Intensifying Rapier

Whenever equipped creature deals combat
damage to a player, put an intensity counter on
that player, then that player takes damage equal
to the amount of intensity counters on it.
Remove all intensity counters if the equipped
creature deals damage to another player.
Equip {2} ({2}: 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.)