Vitality Vessel

At the beginning of your upkeep you gain X life
where X is the number of charge counters on Vitality Vessel.
Whenever Vitality Vessel becomes the target of a
spell or ability, sacrifice it.
When Vitality Vessel is sacrificed, each player
gains X life where X is the number of charge
counters on Vitality Vessel.
Sacrifice a creature, {t}: Put a charge counter on Vitality Vessel.