The Blue Shadow Virus

Enchant Creature

Enchanted creature has infect. (It deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)

"Allow me to present the return of the infamous Blue Shadow Virus."
"The Blue Shadow Virus?! I thought that deadly disease was extinct!"
—Doctor Nuvo Vindi and Padmé Amidala