That could be typical aristocrat synergies like Blood Artist and Midnight Reaper or cards like Serra Paragon and Lurrus of the Dream-Den that can recast the Cleric
While a 1/1 hasty Goblin is pretty bare bones, its activated ability makes it unblockable unless the defending player has a creature with defender, which is highly unlikely and eminently useful in Goblin decks
The gameplay is known for its chaosan unpredictable and dynamic nature that arises from constant transformation, conflict, and the balance between order and chaos
Or it may just be that not many packs of MTG Assassin's Creed have been opened yet, in which case we'd expect to see values come back down again pretty soon
The concept is, that if youre patient, you can come back every twelve hours for more free packets to use toward building your first 20-card competitive deck
Playing lands from graveyard is rarely useful, and if you unlock the Cellar, you probably dont' have mana to cast anything from your graveyard