Riz Gukgak, The Ball

Reach, skulk.
Whenever one or more creatures you control deal combat damage to a player, investigate X, where
X is the amount of damage those creatures dealt
to that player.
{x}, sacrifice X clue tokens: Name a card. Then
surveil X, and if the named card would be put
into your graveyard from your library, put it
onto the battlefield instead if its a permanent. Otherwise, put it in your hand.