Cathedral of steam

For each cathedral, Sarial, the Matriarch of steam
gets an extra ability. With one cathedral, she gets
the ability to be summoned from anywhere.
With two, she gets +2 damage. With three, she
summons two Drill mines when she attacks.
With four, she can be brought back by paying {2}.
All who worship shall be cleansed by my steam. Let it
flow through you and take the impurity from your body
-Sarial, The matriarch of steam