Predatory Urge — ruling 1

The controller of the enchanted creature may activate the ability, not the controller of Predatory Urge.

Predatory Urge — ruling 2

If the enchanted creature’s ability is activated, that creature is the one that will deal and be dealt damage when the ability resolves. It doesn’t matter if Predatory Urge leaves the battlefield or somehow becomes attached to another creature by that time.

Predatory Urge — ruling 3

If the targeted creature leaves the battlefield (or otherwise becomes an illegal target) before the ability resolves, the ability doesn’t resolve. The enchanted creature isn’t dealt damage.

Predatory Urge — ruling 4

On the other hand, if the enchanted creature leaves the battlefield before the ability resolves, the ability continues to resolve. The enchanted creature deals damage to the targeted creature equal to the power the enchanted creature had as it last existed on the battlefield.

Predatory Urge — ruling 5

You may have the enchanted creature target itself with its own ability. If you do, it will deal damage to itself equal to its power, then immediately do it again.

Predatory Urge : règles, fonctionnement et interactions (MTG)

Predatory Urge is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Enchant creature Enchanted creature has ": This creature deals damage equal to its power to target creature. That creature deals damage equal to its power to this creature."

How it works : Predatory Urge

Original English text — Wizards of the Coast / Scryfall

#1October 1, 2009· Wizards of the Coast
The controller of the enchanted creature may activate the ability, not the controller of Predatory Urge.
No other card is named in this ruling.
#2October 1, 2009· Wizards of the Coast
If the enchanted creature’s ability is activated, that creature is the one that will deal and be dealt damage when the ability resolves. It doesn’t matter if Predatory Urge leaves the battlefield or somehow becomes attached to another creature by that time.
No other card is named in this ruling.
#3October 1, 2009· Wizards of the Coast
If the targeted creature leaves the battlefield (or otherwise becomes an illegal target) before the ability resolves, the ability doesn’t resolve. The enchanted creature isn’t dealt damage.
No other card is named in this ruling.
#4October 1, 2009· Wizards of the Coast
On the other hand, if the enchanted creature leaves the battlefield before the ability resolves, the ability continues to resolve. The enchanted creature deals damage to the targeted creature equal to the power the enchanted creature had as it last existed on the battlefield.
No other card is named in this ruling.
#5October 1, 2009· Wizards of the Coast
You may have the enchanted creature target itself with its own ability. If you do, it will deal damage to itself equal to its power, then immediately do it again.
No other card is named in this ruling.