Styx

while Styx Goddess of the Underworld is on the battlefield, whenever a creature goes into a graveyard, exile it, put 1 Lore token on this card
{t}: choose 1:
• remove 1 Lore token from Styx Goddess of the Underworld, if you do so, put target creature in
exile onto the battlefield
• remove X lore tokens from this card, add X {b}{u} to your mana pool