I know that Punsihed on Dentarg/Tarren Mill is a horde guild and on a completely other server then the one you are looking for, but we do not discriminate based on your faction nor your realm. Beside all of that in the War Within the realm you are on has no importance as you can join a guild on any realm 
We are looking for a healer, our main goal is AotC each tier and we do m+ on various levels to the side of all of that as well. We raid Wednesday and Thursday from 21 to 00 server time.
Our next this tier’s heroic clear will be on Wednesday and if you wish to join for a run with us to see is a horde guild match for your gnome, then it is as good as time as any to see.
More info on our main main post Punished [Dentarg/Tarrem Mill][A/H] is looking more for s4!