@dickwad. If you have not yet tried it get a powerful barrage build like the one shared by @Mr_Scooty.
You can get to div2 on 1v1 with legend versions of the ignis bane and aether brace.
In 2v2, you might need the full(or adapted ) version of the build to take on two charging immortals or one of the likes of @Mr_Scooty, @FairyTail, and even @defender 's warriors.
In 2v2, use your anti-immortal as hireling. Get a tanky main char. Here you can use your hybrid summoner.
Here is the tricky part:
Make sure your hireling anti-imm does not take cv toŕrents, or as little as possible. Make him use manashield also.
But how?
At the start of each round, charge immediately to the center of arena. Attack the opponent with main char.
Find a way that your main char. can damage the opponent first before your anti-immortal does.
This way the cv torrents will first go after your main char while your anti-imm will do the killings. The time window is relatively small before the cv torrents start looking for your old man. It should be enough though.
I tried experimenting with a summoning anti-immortal but failed miserably(and amusingly:joy:
). Poor furies die at the sight of charging immortal. Summoned units hate glasscannon masters.
I hope this helps.