Get Witchwood Apple and your armor gain and your taunts that cost 5.
In this kind of matchup, you just want to just slow down your opponent as much as possible by playing massive taunts and then summoning back Grizzlies. Use Swipe to clear a big minion and a few little ones, or go face with the 4.
Bring out massive stuff using your huge hand! Use Oaken Summons to effectively heal for 12 each, same with each Branching Paths, and with Witchwood Grizzly as the only beast in your deck, use Witching Hour to heal for another 12 each, and Ferocious Howl to draw a card AND heal for 10 each. Use Mountain Giants to push face damage, and the wisps off of wispering woods in combination with Power Of The Wild and Savage Roar for a TTK with exactly 30 damage. If your opponent can’t deal with 1 health minions on turn 4, or has explosive trap, you can pull this combo off turn 5. AKA only against high rank mages, really.