Yagorath is mainly point tank that can't atack enough in mobile form. As long as you play on Exterminate and have at least one beam she is no danger. You can counter her better if you also have cards that shorten cooldown of your Beam.

Io can stun Terminus by Luna through his siphon. Damage she deals from weapon is higher than from calamity blast and if she bought nimmble she is uncatchable without Terminus' cards on speed. Without his assistance you shouldn't be afraid of him.

Furia is strong against Lex from long and short disrance. As long as Furia heals are good Lex wins only with damage shooting from weapon. If she uses her skills reasonably and he'll be catched with beam Lex won't have chances to win solo fight.

Androxus is great at short distance but he also can do much from long distance. The best way to counter him is bait him to use Reversal unnecessarily and force him to waste all Nether Steps and just stay grouped up.