Dr. Bob & Mountain Shoutin'

Cantrip - Whenever you cast an instant or sorcery spell with converted mana cost 1, put
a creature card into your hand with power
and toughness equal to the number of cards
in your library divided by the number of
cards in your hand squared, then that card
may exile a card from your graveyard, if it
does, it gains all abilities of it. It costs {4}