Any time a legendary creature with mana value 4 or greater enters under your control, you become the monarch, and if you still hold the crown at your end step, you get two 1/1 soldiers for more value
What catches my eye is this card in a deck that cares about high-power creatures, since Siegemaster will borrow that power whenever it attacks, and it has trample itself
The only way to cast a spell with an unpayable cost is to use an alternative cost that's payable or an effect that casts it "without paying its mana cost" (this is why suspend works for the Vision)
For most decks, controlling the board is a priority over mindlessly attacking the opponent's Leader
The deck used the obviously-undercosted effect of Survival of the Fittest to put powerful creatures directly into the graveyard, only to reanimate them with Recurring Nightmare
MetaZoo I can find MetaZoo packs at one large LGS, but Ive never seen anyone play it myself