2013-04-15 : If you have three or fewer cards in your library, you can’t activate Rot Farm Skeleton’s last ability.

2013-04-15 : Putting four cards from your library into your graveyard is part of the activation cost of Rot Farm Skeleton’s ability. The four cards will be in the graveyard before any player can respond.

2013-04-15 : You can activate the last ability only if Rot Farm Skeleton is in your graveyard.