Storm Conduit's Apprentice

Overkill 2 - Whenever this creature deals 2 or
more excess damage, you may cast an instant
or sorcery from your graveyard with converted
cost equal or less to the excess damage dealt.
As far as there is two or more instant and/or
sorcery spells in your graveyard, Storm Conduit's
Apprentice has flying.
"Teachings for a planeswalker itself, I feel honored"