Knowledgeable Imp

Flying
Sacrifice X Imps you control: Target player
reveals the top X cards of their library, then you
may cast an instant or sorcery card without
paying it's converted mana cost with X or less.
If Knowledgeable Imp would dies, shuffle it back
into your library instead if you control a creature
with power greater then it's toughness.
A deck can have any number of cards name Knowledgeable Imp.