Skithiryx, the Blight Dragon is a mythic Legendary Creature — Phyrexian Dragon Skeleton card from Through the Omenpaths Bonus Sheet (OMB), collector number 22.
Flying Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.) {B}: Skithiryx gains haste until end of turn. {B}{B}: Regenerate Skithiryx.