The text on the Master of the Wild Hunt card:
At the beginning of your upkeep, put a 2/2 green Wolf creature token onto the battlefield.
Tap: Tap all untapped Wolf creatures you control. Each Wolf tapped this way deals damage equal to its power to target creature. That creature deals damage equal to its power divided as its controller chooses among any number of those Wolves.
The text states that each wolf deals damage. This implies that there are multiple damage sources. Can all of this damage be prevented at once, or need it be prevented from each source individually?
For example, look at Unbreathing Horde:
Unbreathing Horde enters the battlefield with a +1/+1 counter on it for each other Zombie you control and each Zombie card in your graveyard.
If Unbreathing Horde would be dealt damage, prevent that damage and remove a +1/+1 counter from it.
If multiple wolves deal damage to Unbreathing Horde simultaneously per Master of the Wild Hunt's activated ability, does it remove one +1/+1 counter per wolf, or just one +1/+1 counter?