Geth, Lord of the Vault, Monoblack Mill (EDH / Commander)

My own brew of Mono-Black Mill, with Geth, Lord of the Vault at the helm.

It's not an extremely effective deck, as Mill tends to be, but it has the incredible distinction of being able to, with enough mana, steal Titans out of the graveyard before they reshuffle the graveyard, and other shenanigans.
It's not budget, nor is it particularly over the top, with a couple of the cards being able to be swapped for cheaper cards (Mana Crypt, the fancy lands and the Tutors are more than half the deck's cost).

General game plan is to simply ramp as efficiently as possible into Geth, begin milling using his own ability, and begin getting advantage from there, stealing mana rocks from opponents and threats. It's not particularly resiliant to board nukes, and runs a fair few itself.
The best card in the deck is probably Dread Summons, from a thematic perspective, but Torment of Hailfire is the "better" card for ending games.

The deck has an infinite damage/mill combo in the form of Bloodchief Ascension and Mindcrank, however, people tend to remove the Bloodchief as soon as possible, due to the power of the card in the deck. If you can manage it, well done, but it's very telegraphed due to Bloodchief requiring it's counters.