You have to sacrifice a creature every turn to keep it, which, in a token deck, is a very small price to pay
They are nearly impossible to contain and highly intelligent, featuring physiological and neural capacities similar to humans
It just sits on the battlefield growing absolutely everything, and if your opponent can't deal with it in a turn or two, they'll have already lost
Then make some mana with firebending four too
Key Cards in the Necron Dynasties Magic the Gathering Decklist Szarekh, the Silent King (Commander) Szarekh, the Silent King is your commander and your engine
Gaining a level won't remove abilities that a Class had at a previous level