Turner, Might of Erdain

When Turner, the Might of Erdain enters the battlefield, sacrifice X creatures. If you do, put that many +1/+1 counters on Turner.
At the beginning your upkeep, you may look at the top Y cards of each player's library, where Y is the number of +1/+1 counters on Erdain. If you do, put those cards back on top of their owner's library in any order. Each player draws a card.