Kordvak Endless

Whenever a creature the horde controls dies, you
may pay {u}{b}. If you do, put that creature onto the battlefield under your control with a sickness counter on it. Activate this ability only once each turn rotation.
Remove the last sickness counter from a creature
you control: target hero draws a card.
[Creatures with sickness counters have base
power and toughness 0/1 if the last sickness counter is removed exile that creature.]