Deathlock can do wonders for the Johktari Beastmaster with her bow and direwolfs, both adding bleed very fast.
Maybe...
-standing next to the Deathlock in a central zone
-with Cerberus guarding,
-wearing eagleclaw boots and nullify
-while keeping the enemy mage one zone away in tanglewine or stuck condition
-with 1-2 dire wolfs to entertain him
...I know, that is a lot of setup to ask for but it is also very scary and you can cast a new tangle-/strangevine/forcehold every turn while shooting arrow after arrow. With 4 or more bleed, the enemy has no choice but to siege cerberus zone or die while running away.
It sounds like lots of fun even if it migth not win