Yardstick

Multikicker {2} (You may pay an additional {2} any number of times as you cast this spell)
When Yardstick enters the battlefield, mill cards
equal to the amount of mana spent to cast it.
Then, you may return a card from your
graveyard to your hand for each time it was
kicked. If a land card was put into your hand
this way you may put it onto the battlefield
instead.