Like most Magic: The Gathering cards, the value of Snow Villiers depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Final Fantasy)
Trap cards have fallen the furthest, with many decks using only the bare minimum, due to the setup time required
Riverchurn Monument is the kind of mill card that scares me, because it tends to combo with a bunch of mill favorites like Bruvac, Phenax, God of Deception, and ways to make players mill a lot of cards (Maddening Cacophony, anyone?)
You cannot declare attacks the turn you activate this effect, except with Xyz Monsters
This looks like the weakest deck to play out of the box considering how easy it is for other players to interrupt your equipment gameplan
Once per turn at quick effect speed, you can negate the activation of any monster effect, while also burning your opponent for 1000 damage