For that role, I turn to the Dimir Midrange shell that sat on the fringes of Standard for a while because of the power of Thought Erasure, Thief of Sanity, and Hostage Taker but never broke into the mainstream because it lacked the necessary density of proactive early plays or a powerful enough end-game as it had when The Scarab God was legal
Each includes 1 deck of 100 Magic cards (99 regular cards and 1 Traditional Foil Mythic Rare card), 10 double-sided token cards, 1 deck box (can hold 100 sleeved cards), 1 strategy guide, and 1 reference card.
The card even gives you a set of two other awesome options to consider for when you don't need to turtle up
2 Edgar Markov Build The Vampire Swarm The premier Vampire Commander, Edgar Markov, creates an army of Vampire tokens for every Vampire spell you cast, turning every creature into a two-for-one value-wise
If you discard a land card, everyone loses life
Spend this mana only to activate abilities