It really comes down to whether or not you think its best to have an enabler or a payoff as your commander, since Szarekh mills you while Imotekh rewards you for getting stuff out of your graveyard once its milled
Azlask, the Swelling ScourgeAzlask, the Swelling Scourge is a 2/2 Eldrazi for three mana that gives you experience counters whenever colorless creatures you control die
Zoroark can be obtained from Promotions in the PROMO-A set
But when you have one in a random 200-500 card deck, they still would be brokenly good, but not enough to take the game over
When it's finally time to attack , let cards like Ursine Monstrosity, Giant Adephage, and Titania, Nature's Force lead the way
Use the sacrificed creature's toughness as it last existed on the battlefield to determine how much life you gain