T here are over 500 cards featuring the knight creature type in Magic: The Gathering
This means that you can freely cast spells before Gush and simply return two already spent Islands to your hand
Fell Rating: 6/10 Two mana to kill any creature is nice and clean
In conjunction with cards you would associate with an Aristocrats deck, Sek'Kuar can provide a great deal of value from already useful cards
Lastly, cards like Bident of Thassa trigger from combat damage to players, and a flyer deck has a good shot of getting something through unblocked, even if its small
To meet the WUBRG requirements, you will have to use the Heroes in a Half Shell card, or you can use Leonardo, the Balance , and pair it up with one of the other Commanders that features the Character Select ability, which is a variation of partner