Puzzle 2.0

Puzzle 2.0 enters the battlefield with X +1/+1 counters on it.
At the beginning of each opponent's upkeep, that player searches his or her library for a card with converted mana cost equal to the number of +1/+1 counters on Puzzle 2.0 and exiles it. If he
or she does not, that player loses the game.
What is life but a constant struggle between savagery and nihilism?