Hearthpwn

The Deck of Lunacy tech we need.

This one is badly designed. The other ones are designed to survive at least one turn, since they have +1 health compared to the removal spells of the same cost, they all require a spell + minion trades. I love the flavour since it's a building, you don't destroy a building so easily.

This one is the only one that get's removed by spells.

Actually if your opponent tries to remove it with a spell it becomes a 5/7, so it essentially does have +1 health compared to the removal spells of the same cost.

Oh nice! Didn't though about that. Indeed it says whenever so it'll trigger instantly.

The other Watchpost is much better. This one can be ignored as long as you clear the other minions, and what type of control deck runs a lot of small minions?

It's a counter to decks like token druid.

Aggro tech vs. control, that's a dud in pretty much any other matchup? Hm...