I love Guardian Gazelle, but she’s not a great pick for a defensive team. For one, you can easily exploit her weakness of damage/full mana loss when you kill her for everyone dancing.
On top of that, if you use her there, you might as well find another hero other than Tyr, because she will wipe out his buffs every time she goes off. And Tyr is extremely useful, but if he can’t heal and revive, he’s pretty much nothing more than a 4 star sniper(like a red Triton, without even his buff to healing).
If it were me, I’d consider stacking the emblemed Ursena and your emblemed Boss Wolf. It’s going to entice yellow stacks obviously, but with Ursena, that’s kind of the point. Before Telluria came along, I used to pair a Kunchen tank with an Ursena flank to pretty decent success. Using Boss Wolf as tank and Ursena as flank kind of gives you the same synergy. You invite the yellow stack, but if the attacker does not get enough yellow tiles soon enough, Ursena hammers them and puts up the yellow reflect, too.
I never had any issues staying in Diamond with them paired or having good success defensively in wars. I can’t see Boss Wolf being much different, especially if you have even somewhat decently leveled mana troops on Boss Wolf.