The reason for that is that they simply depict the Factory in different seasons of the year
Each Set Booster contains a foil-etched legend or Background card, as well as another legend, another Background, a rare or mythic rare, a traditional foil, and two wildcards
9 Overlord Of The Mistmoors Showcase & Fracture Foil - $74.88 With the highest mana cost among the other overlord cards, Overlord of the Mistmoors makes up for it by creating two creature tokens every turn and having the highest power and tougness ratio among the other overlords
While he may grovel and kneel for now, it's nothing more than a temporary situationwhen Lagomos's schemes come to fruition, the Cabal will finally be in his hands
Paying life for colored mana is very strong, so Id imagine that all 5 cards in this cycle will see some play in Commander in decks with heavy colored pips
At six, they get trample