Skithiryx, the Blight Dragon

Legendary Creature — Phyrexian Dragon Skeleton {3}{B}{B} 4/4

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.