Blightsteel Subskeleton

Equip {p/c}{p/c}
Equipped creature has haste, infect and
"Whenever this creature deals damage
to a player, proliferate."
Whenever Blightsteel Subskeleton becomes
equipped to a nontoken creature, sacrifice that
creature and create a token that's a copy of it,
except it's nonlegendary and has indestructible.
Attach Blightsteel Subskeleton to it.