Zerthus, Thief of Thunders

Magecraft — Whenever you cast or copy an
instant or sorcery spell, you may have Zerthus,
Thief of Thunders deal damage to target creature
or planeswalker equal to the number of instant
and sorcery spells you've cast or copied this turn.
Whenever a creature dealt noncombat damage to
by Zerthus, Thief of Thunders dies as a result of
it, you lose 1 life and draw a card. Any excess
damage is then dealt another target creature.