Eilisha Unstable Prism

You don’t lose unspent colored mana as steps
and phases end.
At the beginning of your upkeep, If you have
100 unspent mana, you win the game.
When Eilisha Unstable Mana Conduit leaves
the battlefield, lose all mana and deal damage
equal to the amount of mana lost to each
creature and planeswalker.