Tezzzeret, Agent of Bolas

+1: Look at the top 3 cards of your library. You may reveal an artifact card from them. Put that card in your hand. Put the rest in your graveyard.
-1: Target artifact becomes an artifact creature with base power and toughness 5/5.
-4: Target opponent loses X life and you gain X life where X is twice the number of artifacts you control.