Phantom Knights is an archetype that focuses on its GY effects to generate advantage via searching cards, sending them to the GY, or Special Summoning from the GY, and a secondary gimmick of trap monsters (which are rarely used outside one monster in particular). They primarily focus on making Rank 3 and 4 Xyz monsters in addition to providing materials to summon Link monsters.
Turn 1, Phantom Knights aims to lock out the opponent by summoning Loading... , or putting up negates with monsters like Loading... , Loading... , or Loading... , while on subsequent turns, you want to OTK by using monsters like Loading... or Loading... .
The Phantom Knights of Torn Scales
The most important main deck Phantom Knights monster. It is a Loading... for any Phantom Knights, it discards for cost, which means you can get Phantom Knights cards from your hand into the GY, and it revives itself when a Phantom Knights card is banished as another extender.
The Phantom Knights of Silent Boots
Silent Boots is our typical extender from the hand, since it can be Special Summoned whenever there is a Phantom Knights on your side of the field. In the GY, it searches for a Phantom Knights Spell/Trap, which is usually used to search for Loading... .
The Phantom Knights of Ancient Cloak
Ancient Cloak is our monster searcher. We need to get it to the GY, which is usually achieved via the Loading... effect of Loading... or Loading... . It is also a decent Normal Summon if we happen to have another Level 3 extender in the hand.