I dislike Bull's Endurance since it doesn't do much for your creature, unless the creature has a very low life, like Tataree or Fellella. Generally more armour from Rhino Hide (even with Fortified Position) will keep the creature alive longer, and Bear's Strength makes your Raptor Vines scarier and works nicely wit their Vampiric trait. Though one thing you could do would be to replace your 2 Foritified Position with 2 Sacred Ground and 4 Rhino Hide, and then change the 2 Bull Endurance over to 2 more Bear Strength. Though I'm not sure you'd have the actions to get that out effectively (your Meditation Amulet).
Acid Ball is, in my opinion, the second best Water spell in the game right now. Lots of creatures come out with moderate to high armour and it's very effective against them. Due to the rules of Corrode, it's also mildly effective against Resilient targets. However, it's best use is against armour-stacking mages, particularly a Wizard (-1 or -2 armour and a 5/9 chance to take out the Voltaric Shield for 5 mana is amazing).
Also consider adding a Surging Wave or two. An Unavoidable attack with range of 0-2 and 5/6 chance to Slam can ruin a Forcemaster's day.
