Blue spells you cast cost {1} less to cast for each a nontoken creature you control that died this turn.

Whenever you cast a blue spell you may draw a card. If you do Mortimer, Nervous Wreck gets -1/-1 until end of turn. If Mortimer, Nervous Wreck's toughness was less than 0, exile it, and return it to the battlefield transformed.

Whenever you draw a card, untap Nekrus, Lich in Mourning.

{B}{B}, {t}: Exile target creature card from a Graveyard, create a tapped 2/2 black Zombie creature token.

{t}, Sacrifice another creature you control: gain {B} equal to that creature's mana value.