devtrackers.gg
I have one. It's the Hydra for XGG that fights and it comes into play whole I control The Great Henge. Current default is to have the henge trigger go first, then Hydra trigger on top of that. It's almost always better to have the Hydra be put on first then the Henge on top of it.
I haven't played Wicked Wolf with a Henge yet but I suspect it has the same problem. In fact I can't recall if any of the ETB fighting creatures have the Henge stack first.
It's a pity, our system really cuts Voracious Hydra a raw deal. The only context it has for deciding where to stack the trigger is "When CARDNAME enters the battlefield, choose one" - it can't investigate what the options are. Also, it's possible that those options are wildly different in where they would want to be sorted - at the extremes, one option could win you the game and one could lose you the game, but there are many possibilities between.
Annoyingly, both "Double the number of +1/+1 counters on CARDNAME" and "CARDNAME fights target creature you don’t control" would normally be sorted to occur after the Great Henge's trigger, but the "we don't know anything about this modal" sorting weight is the default value, which is stacked to resolve before the Great Henge. #wotc_staff
