Entirely Normal Armchair
Unstable
Uncommon
Artifact 
During your turn, if Entirely Normal Armchair is in your hand, you may hide it on the battlefield.
{0}: Return Entirely Normal Armchair to its owner's hand. Only any opponent may activate this ability and only if he or she sees Entirely Normal Armchair.
{2}, Sacrifice Entirely Normal Armchair: Destroy target attacking creature.