Riverchurn Monument is a rare Artifact card from Magic: The Gathering (Aetherdrift, DFT). Current market price: $2.75.
Rare
Aetherdrift (DFT)
{1}{U}
Mana Value
2
Colors
U
Card Text
{1}, {T}: Any number of target players each mill two cards. (Each of them puts the top two cards of their library into their graveyard.)
Exhaust — {2}{U}{U}, {T}: Any number of target players each mill cards equal to the number of cards in their graveyard. (Activate each exhaust ability only once.)
