Barrel of Monkeys

When Barrel of Monkeys enters the battlefield,
put it on top of any barrel-shaped object (like a
soda can). Put a barrel counter on it.
At the beginning of each players end step, they
pick a number (1-6) and roll a 6-sided dice. If the number doesn't match the number rolled, put a
barrel counter on Barrel of Monkeys. If the
chosen number matches the number rolled, that
player creates a monkey token for each counter
and shuffles them into their library face up.