Billy, Jigsaw's Puppet

Indestructible
When this creature enters the battlefield, each
player gets a jigsaw counter and loses life equal to
the number of jigsaw counters that player has.
At the beginning of each player's upkeep, if that
player has 10 or more jigsaw counters, then
that player wins the game.When this creature
leaves the battlefield, each opponent gets a jigsaw counter.
"I wanna play a game..." -Jigsaw