Mass army

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

Choose one — • Untap all lands you control. • Until end of turn, lands you control become 2/2 creatures that are still lands. Entwine (Choose both if you pay the entwine cost.)

Creatures you control get +3/+3 and gain trample until end of turn. (Each of those creatures can deal excess combat damage to the player or planeswalker it's attacking.)

Count the number of cards in your library. Your life total becomes that number.