Puresteel Paladin
Creature — Human Knight
Whenever an Equipment you control enters, you may draw a card.
Metalcraft — Equipment you control have equip 
as long as you control three or more artifacts.
Jason Chan
Commander Masters (CMM)
• #51Rulings
Once the equip {0} ability is activated, causing Puresteel Paladin to leave the battlefield or causing its controller to control fewer than three artifacts won't stop the equip ability from resolving.
(wotc • 2020-08-07)
You may still activate the Equipment's other equip abilities if you wish.
(wotc • 2020-08-07)
Rulings
Once the equip {0} ability is activated, causing Puresteel Paladin to leave the battlefield or causing its controller to control fewer than three artifacts won't stop the equip ability from resolving.
(wotc • 2020-08-07)
You may still activate the Equipment's other equip abilities if you wish.
(wotc • 2020-08-07)