Ironclad has enough expensive attacks and reasons to care about a card exhausting that Infernal Blade can be worth picking up as a way to deal some damage in Act 1. Something to consider with cards which have variance in how well they perform: If your deck is already strong enough to win with reliable options, taking cards with variance risks it misfiring and losing. On the other hand, if you're struggling to survive the act, the variance can give you a potential way to come back.
