Daris Pyry, Squall Mage

{3}{u}, {t}, Discard a card: Target player mills
X, where X is the number of lands you
control. If any {s} was used to activate this ability, you may tap target creature. It doesn't untap during its controller's next untap step.

Whenever you discard a land card, Daris Pyry, Squall Mage explores.