A card that I might consider to be absolutely necessary could require cheaper options in other parts of the deck to make it fit
That's why you use Drain Life, Corrupt, Soul Burn, and Zuran Orb to make sure you have plenty of cards to draw
Form of the Mulldrifter Form of the Mulldrifter can help you dig through your deck much faster since even a dead draw is now a way to draw more cards
It was also part of a card drawing and holding complex with Library of Alexandria and was reinforced by several cards that would refill hands to seven cards, putting the Tower's ability back in play
Also, if you want to learn to play, or you already play Commander, these decks will either be a great place to start, or be great tools to use in your future deck building, especially if you want to fully immerse yourself into the Doctor Who experience
If return gets more votes, each player returns up to two cards from their graveyard to their hand, then you exile Sail into the West