Fille Fantôme, Grim Maiden.

Friends in low places • As long as Fille Fantôme is
in the command zone or off the battlefield,
Zombies, Skeletons, Spirits, and Vampires
cost {1} less to cast.
{p/b}{p/b}{p/b}, tap all untapped Zombies,
Skeletons, Spirits, or vampires. All Zombies,
Skeletons, Spirit, and vampires gain
+1 +1 counters.