Although most factions make frequent use of cheap champions, The Forge is an exception. Its synergy is so strong that even spending 3 magic on a champion like Titan can be hard to justify. Unlike other 3-cost champions, Titan’s timing is often tricky. Its ability is powerful, but its stats are underwhelming, and it has a significant drawback. If you can activate its ability every turn, it can be valuable- allowing you to optimize the use of Workshops, Sentry Cogs, and perform clever unit maneuvers. However, since Titan's ability only affects adjacent units, positioning can be challenging.
Unless you have a specific plan for Titan, it’s often better to invest in Ember Cogs and Blastforge Cogs instead.