Zombie Onslaught

At the beginning of each players upkeep that player
puts the top X cards of their library into the
graveyard, where X is the number of round
counters on this card. Then each player creates a
2/2 black Zombie creature token.

If a player casts a spell that targets and destroys this
card remove a round counter from this card instead.

At the beginning of your upkeep put a round
counter on this card.