Obliterate

You may exile a black card from your hand rather than pay this spell's mana cost. Target player reveals their hand. You choose a nonland card from it. That player discards that card.

As this artifact enters, pay any amount of life. 4, T: Create an X/X black Phyrexian Minion creature token, where X is the life paid as this artifact entered.

1, T: Exile target creature you control. 7, T: Exile target creature you don't control. When Helvault is put into a graveyard from the battlefield, return all cards exiled with it to the battlefield under their owners' control.

Add BBB. Threshold — Add BBBBB instead if there are seven or more cards in your graveyard.

This land enters tapped. T: Add U. Transmute 1UU (1UU, Discard this card: Search your library for a card with mana value 0, reveal it, put it into your hand, then shuffle. Transmute only as a sorcery.)

(2/B can be paid with any two mana or with B. This card's mana value is 6.) Search your library for a card with mana value less than or equal to the number of lands you control, reveal it, put it into your hand, then shuffle.

1UU: Target permanent becomes an artifact in addition to its other types. (This effect lasts indefinitely.) 3U: Gain control of target artifact. (This effect lasts indefinitely.)

At the beginning of your upkeep, if you have exactly 1 life, you win the game.