Unlocked Potential

Spell Mastery, Threshold, Delerium, Hellbent, Surge
—This spell costs {1} less to cast if you have two
or more instants and/or sorceries in your
graveyard, {1} less if you have seven or more cards
in your graveyard, {1} less if you have four or
more card types among cards in your graveyard,
{1} less if you have no cards in hand, and {1} less
if you or a teammate has cast a spell this turn.
Draw four cards.