"When something dies, all things benefit. Well okay, just our things."
—Ezoc, Golgari rot farmer

Vulturous Zombie

Flying
Whenever a card is put into an opponent's graveyard from anywhere, put a +1/+1 counter on this creature.

Commander Anthology Volume II

Flying
Whenever a card is put into an opponent's graveyard from anywhere, put a +1/+1 counter on Vulturous Zombie.

Commander Anthology

Commander 2016

Commander 2015

Commander 2011

The ability doesn’t care why a card goes to your opponent’s graveyard — only that it does. The ability triggers when a card is put into your opponent’s graveyard from the stack (a spell resolves, fails to resolve, or is countered), from the battlefield (a permanent is destroyed or sacrificed), from the player’s hand (a card is discarded), from the player’s library (from a Millstone-like effect), or from any other zone.

This ability triggers only on cards, so it won’t trigger when a token is put into your opponent’s graveyard.