eternity contract

Imprint — , : You may exile an instant or sorcery card with mana value X from your hand. At the beginning of your upkeep, you may copy a card exiled with this artifact. If you do, you may cast the copy without paying its mana cost.

Draw four cards. You lose half your life, rounded up.

This artifact enters with X charge counters on it, where X is your life total. Landfall — Whenever a land you control enters, you may have your life total become the number of charge counters on this artifact.