Snrigels, Mass Hoarder

Whenever mana empties from your mana pool as
steps and phases end, create X colorless Treasure artifact tokens, where X is half the amount of
mana emptied from your mana pool, rounded up.
When Snrigels, Mass Hoarder dies, add as much
mana to your mana pool as possible. At the
beginning of the next end step, you lose life equal
to the amount of mana that emptied from your
mana pool this turn.