M13: Sands of Delirium, Artifact 3 {X}, {T}: Target player puts the top X cards of their library into their graveyard.

Sands of Delirium

X, T: Target player puts the top X cards of their library into their graveyard.

7/1/2012 If the player has fewer than X cards in their library, they put all of them into their graveyard.