Plague Serpent

Flash, Deathtouch
Plague {1}{b} (Put a -1/-1 counter on target creature. Plague only as a sorcery)
{9}{b}Sacrifice this creature: deal damage to each opponent equal to the number of -1/-1 counters on their creatures.
Known as Gildrich's favorite pet, it carries out it's master's orders to eradicate the unworthy.