For Zerg, Marine/Tank/Medivac adding in ghosts if you scout infestors or a hive tech is a good option. This build also gives you the option to open reactor factory and go into reactored helions.
Marine/marauder/ghost/medivac adding in vikings if you scout robo tech or just 1/1/1 (this is an all-in build) vs Protoss should be fine.
For Terran, Artosis is a major proponent of mech, but pure mech is just going to get you killed as a bronze/silver level player probably. I'd say marine/tank/viking and some medivac support would be ok. Vikings to get your tanks vision. Air superiority is important if you're going into tank vs tank playing.
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