AVR: Dreadwaters, Sorcery 3U Target player puts the top X cards of their library into their graveyard, where X is the number of lands you control.

Dreadwaters

Target player puts the top X cards of their library into their graveyard, where X is the number of lands you control.

5/1/2012 The number of cards put into the graveyard is based on the number of lands you control when Dreadwaters resolves.