Kareg and Urereg of Phyrexia

Before the game starts you must reveal Kareg and Urereg of Phyrexia from your deck, when you do or if Kareg and Urereg of Phyrexia is your comander, you may have have cards with phyrexian mana symbols of any color in your deck.
First Strike, Haste, Infect, Lifelink, Sulk, Trample