Wraith, Void Walker

Shroud, Investigate
When Wraith, Void Walker attacks look at the top card of your opponent's deck. You may play those cards without paying their mana cost
{u} Discover {4}
{1}{u} Look at the top card of a target player's deck. If it is permanent, you may make a token copy of that card. If you do that player puts the top two cards of their deck into their graveyard.