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.
The only way to stop those possessed by the spirits of the book is through the act of bodily dismemberment.
Fay Dalton
Secret Lair Drop (SLD)
• #1352Rulings
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)