Absorption Dome [CRU104] Unlimited Normal

Absorbtion Dome enters the arena with steam counters on it equal to the number of times you have boosted this turn. If your hero would be dealt damage, instead remove that many steam counters from Absorbtion Dome and prevent damage that source would deal equal to the number of steam counters removed this way. When Absorbtion Dome has no steam counters on it, destroy it.