Tzar is a superheavy tank, equipped with a powerful AoE plasma cannon that can obliterate whole groups of units with one shot. It is very heavily armored and can take massive amounts of damage.

It defines a great use in an early T2 game.

Take it to the front covered by some AA units in order to push through the remaining T1 units and defenses like a hot knife through butter. Better try not to lose it, though, because it leaves very precious wreckage (894 metal).

Tzar is inferior to Banisher in range, but fires faster. It cannot see as far as it can shoot—ensure you have a spotter.