Marsys, Blade Animist

Marsys, Blade Animist gets +1/+1 for each
artifact creature you control.
Whenever an equipment enters the battlefield
under your control, create a 2/2 white Sentient
Sword artifact creature token, and attach the equipment to it.
Whenever an opponent casts an equipment
spell, you may pay {4}. If you do, it enters the
battlefield under your control.