Tempest Mage

Whenever you cast an Instant or Sorcery put a charge counter on Tempest Mage.
{t}, Remove a charge counter from Tempest Mage: Deal 2 damage divided as you choose among up to two targets.
{t}, Remove 3 charge counters from Tempest Mage: Deal 3 damage to any target. Draw 2 cards.
{t}, Remove 8 charge counters from Tempest Mage: Deal 6 damage to target opponent and each creature they control. Draw 4 cards.