The Knights cards make it easy to get the 3 tributes necessary to summon Slifer, can also be summoned by tributing opponents monsters with Soul Crossing
The Knights cards also make it easy to recycle cards from the graveyard to your hand, thus powering up Slifer, through cards like Joker's Knight, Joker's Wild, and Joker's Straight
This is not a meta deck, just one that could be fun to play for certain players
Could definitely change some things about the deck after more playtesting